Conditionally find getopt.h.

[_LIBC] (getopt_long, getopt_long_only): Do libc_hidden_def.

lib-src/getopt1.c

 /* getopt_long and getopt_long_only entry points for GNU getopt.
    Copyright (C) 1987,88,89,90,91,92,93,94,96,97,98
      Free Software Foundation, Inc.
-   NOTE: The canonical source of this file is maintained with the GNU C Library.
-   Bugs can be reported to bug-glibc@gnu.org.
+   This file is part of the GNU C Library.
 
-   This program is free software; you can redistribute it and/or modify it
-   under the terms of the GNU General Public License as published by the
-   Free Software Foundation; either version 2, or (at your option) any
-   later version.
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
-   You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software Foundation,
+   You should have received a copy of the GNU General Public License along
+   with this program; if not, write to the Free Software Foundation,
    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
 
 #ifdef HAVE_CONFIG_H
 #include <config.h>
+#endif
+
+#ifdef _LIBC
+# include <getopt.h>
 #else
+# include "getopt.h"
+#endif
+
 #if !defined __STDC__ || !__STDC__
 /* This is a separate conditional since some stdc systems
    reject `defined (const)'.  */
@@ -28,9 +34,6 @@
 #define const
 #endif
 #endif
-#endif
-
-#include "getopt.h"
 
 #include <stdio.h>
 
@@ -90,6 +93,10 @@ getopt_long_only (argc, argv, options, long_options, opt_index)
   return _getopt_internal (argc, argv, options, long_options, opt_index, 1);
 }
 
+# ifdef _LIBC
+libc_hidden_def (getopt_long)
+libc_hidden_def (getopt_long_only)
+# endif
 
 #endif	/* Not ELIDE_CODE.  */
 
@@ -186,3 +193,4 @@ main (argc, argv)
 }
 
 #endif /* TEST */
+