Fix extra PLT reference in libc.so due to __glob64_time64 if build with gcc 7.5 on 32bit.

Starting with recent commit 84f7ce8447
"posix: Add glob64 with 64-bit time_t support", elf/check-localplt
fails due to extra PLT reference __glob64_time64 in __glob64_time64
itself.

This is observable with gcc 7.5 on x86_64 with -m32 or s390x with
-m31.  E.g. if build with gcc 10, gcc is generating a call to
__glob64_time64.localalias.

This patch is adding a hidden version of __glob64_time64 in the
same way as for __globfree64_time64.

include/glob.h

@@ -31,6 +31,7 @@ typedef struct
 extern int __glob64_time64 (const char *pattern, int flags,
 			    int (*errfunc) (const char *, int),
 			    glob64_time64_t *pglob);
+libc_hidden_proto (__glob64_time64)
 void __globfree64_time64 (glob64_time64_t *pglob);
 libc_hidden_proto (__globfree64_time64)
 # endif

posix/glob64-time64.c

@@ -43,6 +43,7 @@ __glob64_time64 (const char *pattern, int flags,
   __set_errno (ENOSYS);
   return GLOB_NOSYS;
 }
+libc_hidden_def (__glob64_time64)
 
 stub_warning (glob64)
 

sysdeps/unix/sysv/linux/glob64-time64.c

@@ -41,4 +41,5 @@
 # define COMPILE_GLOB64	1
 
 # include <posix/glob.c>
+libc_hidden_def (__glob64_time64)
 #endif