Update copyright dates with scripts/update-copyrights

I used these shell commands:

../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright
(cd ../glibc && git commit -am"[this commit message]")

and then ignored the output, which consisted lines saying "FOO: warning:
copyright statement not found" for each of 6694 files FOO.
I then removed trailing white space from benchtests/bench-pthread-locks.c
and iconvdata/tst-iconv-big5-hkscs-to-2ucs4.c, to work around this
diagnostic from Savannah:
remote: *** pre-commit check failed ...
remote: *** error: lines with trailing whitespace found
remote: error: hook declined to update refs/heads/master

20 files changed, 20 insertions, 20 deletions

diff --git a/mach/Machrules b/mach/Machrules
index 132b06cede..5839378009 100644
--- a/mach/Machrules
+++ b/mach/Machrules
@@ -1,5 +1,5 @@
 # Rules for MiG interfaces that want to go into the C library.
-# Copyright (C) 1991-2020 Free Software Foundation, Inc.
+# Copyright (C) 1991-2021 Free Software Foundation, Inc.
 # This file is part of the GNU C Library.
 
 # The GNU C Library is free software; you can redistribute it and/or
diff --git a/mach/Makefile b/mach/Makefile
index b3ad3f4e26..59922486d5 100644
--- a/mach/Makefile
+++ b/mach/Makefile
@@ -1,4 +1,4 @@
-# Copyright (C) 1991-2020 Free Software Foundation, Inc.
+# Copyright (C) 1991-2021 Free Software Foundation, Inc.
 # This file is part of the GNU C Library.
 
 # The GNU C Library is free software; you can redistribute it and/or
diff --git a/mach/devstream.c b/mach/devstream.c
index f3b2d780db..f7c8e9d1ef 100644
--- a/mach/devstream.c
+++ b/mach/devstream.c
@@ -1,6 +1,6 @@
 /* stdio on a Mach device port.
    Translates \n to \r\n on output, echos and translates \r to \n on input.
-   Copyright (C) 1992-2020 Free Software Foundation, Inc.
+   Copyright (C) 1992-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
diff --git a/mach/lock-intern.h b/mach/lock-intern.h
index 77fc4d17f8..c1f73909ca 100644
--- a/mach/lock-intern.h
+++ b/mach/lock-intern.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 1994-2020 Free Software Foundation, Inc.
+/* Copyright (C) 1994-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
diff --git a/mach/lowlevellock.h b/mach/lowlevellock.h
index 9798d153cf..e2344ab431 100644
--- a/mach/lowlevellock.h
+++ b/mach/lowlevellock.h
@@ -1,5 +1,5 @@
 /* Low-level lock implementation.  Mach gsync-based version.
-   Copyright (C) 1994-2020 Free Software Foundation, Inc.
+   Copyright (C) 1994-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
diff --git a/mach/mach.h b/mach/mach.h
index ee07610eb6..435de4fbd8 100644
--- a/mach/mach.h
+++ b/mach/mach.h
@@ -1,5 +1,5 @@
 /* Standard header for all Mach programs.
-   Copyright (C) 1993-2020 Free Software Foundation, Inc.
+   Copyright (C) 1993-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
diff --git a/mach/mach/mach_traps.h b/mach/mach/mach_traps.h
index d50f1a7b75..a1ea595c91 100644
--- a/mach/mach/mach_traps.h
+++ b/mach/mach/mach_traps.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 1994-2020 Free Software Foundation, Inc.
+/* Copyright (C) 1994-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
diff --git a/mach/mach/mig_support.h b/mach/mach/mig_support.h
index cca0716b87..fa38761604 100644
--- a/mach/mach/mig_support.h
+++ b/mach/mach/mig_support.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 1993-2020 Free Software Foundation, Inc.
+/* Copyright (C) 1993-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
diff --git a/mach/mach_init.c b/mach/mach_init.c
index afd87ed0b9..a122f77df1 100644
--- a/mach/mach_init.c
+++ b/mach/mach_init.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1992-2020 Free Software Foundation, Inc.
+/* Copyright (C) 1992-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
diff --git a/mach/mach_init.h b/mach/mach_init.h
index dd025980b4..70b02bcc9a 100644
--- a/mach/mach_init.h
+++ b/mach/mach_init.h
@@ -1,5 +1,5 @@
 /* Declarations and macros for the basic Mach things set at startup.
-   Copyright (C) 1993-2020 Free Software Foundation, Inc.
+   Copyright (C) 1993-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
diff --git a/mach/mig-alloc.c b/mach/mig-alloc.c
index 64c01d8369..bf21157b70 100644
--- a/mach/mig-alloc.c
+++ b/mach/mig-alloc.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1992-2020 Free Software Foundation, Inc.
+/* Copyright (C) 1992-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
diff --git a/mach/mig-dealloc.c b/mach/mig-dealloc.c
index e71bbb95ec..b4e62ee589 100644
--- a/mach/mig-dealloc.c
+++ b/mach/mig-dealloc.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1992-2020 Free Software Foundation, Inc.
+/* Copyright (C) 1992-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
diff --git a/mach/mig-reply.c b/mach/mig-reply.c
index 0e370d0d3c..cc64b8dc9f 100644
--- a/mach/mig-reply.c
+++ b/mach/mig-reply.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1992-2020 Free Software Foundation, Inc.
+/* Copyright (C) 1992-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
diff --git a/mach/mig_memcpy.c b/mach/mig_memcpy.c
index df8fd5e9af..1f87f64a79 100644
--- a/mach/mig_memcpy.c
+++ b/mach/mig_memcpy.c
@@ -1,5 +1,5 @@
 /* memcpy stub for mig stubs in libmachuser and libhurduser.
-   Copyright (C) 2020 Free Software Foundation, Inc.
+   Copyright (C) 2020-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
diff --git a/mach/msgserver.c b/mach/msgserver.c
index 0043ecfb7f..2f72f0315a 100644
--- a/mach/msgserver.c
+++ b/mach/msgserver.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1993-2020 Free Software Foundation, Inc.
+/* Copyright (C) 1993-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
diff --git a/mach/mutex-init.c b/mach/mutex-init.c
index fc898f66d4..8cb06eb91e 100644
--- a/mach/mutex-init.c
+++ b/mach/mutex-init.c
@@ -1,5 +1,5 @@
 /* Initialize a cthreads mutex structure.
-   Copyright (C) 1995-2020 Free Software Foundation, Inc.
+   Copyright (C) 1995-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
diff --git a/mach/mutex-solid.c b/mach/mutex-solid.c
index 13c01fb511..69a4edd798 100644
--- a/mach/mutex-solid.c
+++ b/mach/mutex-solid.c
@@ -1,5 +1,5 @@
 /* Stub versions of mutex_lock_solid/mutex_unlock_solid for no -lthreads.
-   Copyright (C) 1995-2020 Free Software Foundation, Inc.
+   Copyright (C) 1995-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
diff --git a/mach/setup-thread.c b/mach/setup-thread.c
index 3aa0391f2a..ae501675b5 100644
--- a/mach/setup-thread.c
+++ b/mach/setup-thread.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991-2020 Free Software Foundation, Inc.
+/* Copyright (C) 1991-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
diff --git a/mach/spin-lock.h b/mach/spin-lock.h
index 3708945940..493e9a2078 100644
--- a/mach/spin-lock.h
+++ b/mach/spin-lock.h
@@ -1,5 +1,5 @@
 /* Definitions of user-visible names for spin locks.
-   Copyright (C) 1994-2020 Free Software Foundation, Inc.
+   Copyright (C) 1994-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
diff --git a/mach/spin-solid.c b/mach/spin-solid.c
index 32abc74ed8..ae6574f487 100644
--- a/mach/spin-solid.c
+++ b/mach/spin-solid.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1994-2020 Free Software Foundation, Inc.
+/* Copyright (C) 1994-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or