Update from Gnulib

This incorporates:
2020-02-22 fchmodat, lchmod: simplify
2020-02-22 lchmod: fix link error on Solaris 10
2020-02-22 use 'restrict' in all POSIX function declarations
2020-02-22 chmodat, chownat: new modules
* lib/gnulib.mk.in: Regenerate.
* lib/inttypes.in.h, lib/openat.h, lib/signal.in.h:
* lib/stdio.in.h, lib/stdlib.in.h, lib/string.in.h:
* lib/sys_stat.in.h, lib/time.in.h, lib/unistd.in.h, m4/inttypes.m4:
* m4/signal_h.m4, m4/stdio_h.m4, m4/stdlib_h.m4, m4/string_h.m4:
* m4/sys_socket_h.m4, m4/sys_stat_h.m4, m4/time_h.m4:
* m4/unistd_h.m4: Copy from Gnulib.

1 files changed, 3 insertions, 1 deletions

diff --git a/m4/stdlib_h.m4 b/m4/stdlib_h.m4
index 61a3e31edac..743066a6336 100644
--- a/m4/stdlib_h.m4
+++ b/m4/stdlib_h.m4
@@ -1,4 +1,4 @@
-# stdlib_h.m4 serial 48
+# stdlib_h.m4 serial 49
 dnl Copyright (C) 2007-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -27,6 +27,8 @@ AC_DEFUN([gl_STDLIB_H],
     posix_openpt ptsname ptsname_r qsort_r random random_r reallocarray
     realpath rpmatch secure_getenv setenv setstate setstate_r srandom
     srandom_r strtod strtold strtoll strtoull unlockpt unsetenv])
+
+  AC_REQUIRE([AC_C_RESTRICT])
 ])
 
 AC_DEFUN([gl_STDLIB_MODULE_INDICATOR],