Import gnulib argp module.

* gnulib/argp-ba.c: New file.
	* gnulib/argp-eexst.c: Likewise.
	* gnulib/argp-fmtstream.c: Likewise.
	* gnulib/argp-fmtstream.h: Likewise.
	* gnulib/argp-fs-xinl.c: Likewise.
	* gnulib/argp-help.c: Likewise.
	* gnulib/argp-namefrob.h: Likewise.
	* gnulib/argp-parse.c: Likewise.
	* gnulib/argp-pin.c: Likewise.
	* gnulib/argp-pv.c: Likewise.
	* gnulib/argp-pvh.c: Likewise.
	* gnulib/argp-version-etc.c: Likewise.
	* gnulib/argp-version-etc.h: Likewise.
	* gnulib/argp-xinl.c: Likewise.
	* gnulib/argp.h: Likewise.

gnulib/argp-pvh.c

@@ -0,0 +1,31 @@
+/* Default definition for ARGP_PROGRAM_VERSION_HOOK.
+   Copyright (C) 1996, 1997, 1999, 2004, 2009, 2010 Free Software Foundation,
+   Inc.
+   This file is part of the GNU C Library.
+   Written by Miles Bader <miles@gnu.ai.mit.edu>.
+
+   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 3 of the License, 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, see <http://www.gnu.org/licenses/>.  */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include "argp.h"
+
+/* If set by the user program to a non-zero value, then a default option
+   --version is added (unless the ARGP_NO_HELP flag is used), which calls
+   this function with a stream to print the version to and a pointer to the
+   current parsing state, and then exits (unless the ARGP_NO_EXIT flag is
+   used).  This variable takes precedent over ARGP_PROGRAM_VERSION.  */
+void (*argp_program_version_hook) (FILE *stream, struct argp_state *state) = NULL;