[glibc] Merge _GL_UNUSED C23 patch from Gnulib

[Paul Eggert <eggert@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=464138e90497be474fdbb19eebc0269ea24c5ce1

commit 464138e90497be474fdbb19eebc0269ea24c5ce1
Author: Paul Eggert <eggert@cs.ucla.edu>
Date:   Tue Aug 23 21:16:39 2022 -0700

    Merge _GL_UNUSED C23 patch from Gnulib
    
    * posix/getopt.c (_getopt_initialize):
    * sysdeps/posix/tempname.c (try_dir, try_nocreate):
    Put _GL_UNUSED before args instead of after.
    This makes no difference for glibc.
    It is needed for Gnulib when being compiled on
    non-GCC C23 compilers.

Diff:
---
 posix/getopt.c           | 4 ++--
 sysdeps/posix/tempname.c | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/posix/getopt.c b/posix/getopt.c
index e9661c79fa..a160a4e3bd 100644
--- a/posix/getopt.c
+++ b/posix/getopt.c
@@ -377,8 +377,8 @@ process_long_option (int argc, char **argv, const char *optstring,
 /* Initialize internal data upon the first call to getopt.  */
 
 static const char *
-_getopt_initialize (int argc _GL_UNUSED,
-		    char **argv _GL_UNUSED, const char *optstring,
+_getopt_initialize (_GL_UNUSED int argc,
+		    _GL_UNUSED char **argv, const char *optstring,
 		    struct _getopt_data *d, int posixly_correct)
 {
   /* Start processing options with ARGV-element 1 (since ARGV-element 0
diff --git a/sysdeps/posix/tempname.c b/sysdeps/posix/tempname.c
index ebd2a43951..60f8541085 100644
--- a/sysdeps/posix/tempname.c
+++ b/sysdeps/posix/tempname.c
@@ -181,13 +181,13 @@ try_file (char *tmpl, void *flags)
 }
 
 static int
-try_dir (char *tmpl, void *flags _GL_UNUSED)
+try_dir (char *tmpl, _GL_UNUSED void *flags)
 {
   return __mkdir (tmpl, S_IRUSR | S_IWUSR | S_IXUSR);
 }
 
 static int
-try_nocreate (char *tmpl, void *flags _GL_UNUSED)
+try_nocreate (char *tmpl, _GL_UNUSED void *flags)
 {
   struct_stat64 st;