Fix compiler issue with mmap_internal

Compiling mmap_internal fails to compile when we use -1 for MMAP2_PAGE_UNIT
on 32 bit architectures.  The error is as follows:

    ../sysdeps/unix/sysv/linux/mmap_internal.h:30:8: error: unknown type
    name 'uint64_t'
    |
       30 | static uint64_t page_unit;
	  |
	  |        ^~~~~~~~

Fix by adding including stdint.h.

1 files changed, 2 insertions, 0 deletions

diff --git a/sysdeps/unix/sysv/linux/mmap_internal.h b/sysdeps/unix/sysv/linux/mmap_internal.h
index 5ca6976191..35e112cc77 100644
--- a/sysdeps/unix/sysv/linux/mmap_internal.h
+++ b/sysdeps/unix/sysv/linux/mmap_internal.h
@@ -19,6 +19,8 @@
 #ifndef MMAP_INTERNAL_LINUX_H
 #define MMAP_INTERNAL_LINUX_H 1
 
+#include <stdint.h>
+
 /* This is the minimum mmap2 unit size accept by the kernel.  An architecture
    with multiple minimum page sizes (such as m68k) might define it as -1 and
    thus it will queried at runtime.  */