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

6 files changed, 6 insertions, 6 deletions

diff --git a/sysdeps/powerpc/bits/fenv.h b/sysdeps/powerpc/bits/fenv.h
index 3a4f3dad32..e5da9620bc 100644
--- a/sysdeps/powerpc/bits/fenv.h
+++ b/sysdeps/powerpc/bits/fenv.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 1997-2020 Free Software Foundation, Inc.
+/* Copyright (C) 1997-2021 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/sysdeps/powerpc/bits/floatn.h b/sysdeps/powerpc/bits/floatn.h
index 8424b56b29..fab164e0a2 100644
--- a/sysdeps/powerpc/bits/floatn.h
+++ b/sysdeps/powerpc/bits/floatn.h
@@ -1,5 +1,5 @@
 /* Macros to control TS 18661-3 glibc features on powerpc.
-   Copyright (C) 2017-2020 Free Software Foundation, Inc.
+   Copyright (C) 2017-2021 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/sysdeps/powerpc/bits/fp-fast.h b/sysdeps/powerpc/bits/fp-fast.h
index fc3b6cb7b4..44087aeef8 100644
--- a/sysdeps/powerpc/bits/fp-fast.h
+++ b/sysdeps/powerpc/bits/fp-fast.h
@@ -1,5 +1,5 @@
 /* Define FP_FAST_* macros.  PowerPC version.
-   Copyright (C) 2016-2020 Free Software Foundation, Inc.
+   Copyright (C) 2016-2021 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/sysdeps/powerpc/bits/hwcap.h b/sysdeps/powerpc/bits/hwcap.h
index e8f3fdea92..17aa48fc63 100644
--- a/sysdeps/powerpc/bits/hwcap.h
+++ b/sysdeps/powerpc/bits/hwcap.h
@@ -1,5 +1,5 @@
 /* Defines for bits in AT_HWCAP and AT_HWCAP2.
-   Copyright (C) 2012-2020 Free Software Foundation, Inc.
+   Copyright (C) 2012-2021 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/sysdeps/powerpc/bits/link.h b/sysdeps/powerpc/bits/link.h
index d00ff68bc1..1b96edd859 100644
--- a/sysdeps/powerpc/bits/link.h
+++ b/sysdeps/powerpc/bits/link.h
@@ -1,5 +1,5 @@
 /* Machine-specific declarations for dynamic linker interface.  PowerPC version
-   Copyright (C) 2004-2020 Free Software Foundation, Inc.
+   Copyright (C) 2004-2021 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/sysdeps/powerpc/bits/setjmp.h b/sysdeps/powerpc/bits/setjmp.h
index a6299bffde..c738ae9ee4 100644
--- a/sysdeps/powerpc/bits/setjmp.h
+++ b/sysdeps/powerpc/bits/setjmp.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 1997-2020 Free Software Foundation, Inc.
+/* Copyright (C) 1997-2021 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