locale.c, locale.h: no need for hidden duplocale

Signed-off-by: Peter S. Mazinger <ps.m@gmx.net>

include/locale.h

@@ -204,7 +204,6 @@ libc_hidden_proto(newlocale)
 /* Return a duplicate of the set of locale in DATASET.  All usage
    counters are increased if necessary.  */
 extern __locale_t duplocale (__locale_t __dataset) __THROW;
-libc_hidden_proto(duplocale)
 
 /* Free the data associated with a locale dataset previously returned
    by a call to `setlocale_r'.  */

libc/misc/locale/locale.c

@@ -1337,7 +1337,6 @@ __locale_t duplocale(__locale_t dataset)
 	}
 	return r;
 }
-libc_hidden_def(duplocale)
 
 #endif
 /**********************************************************************/