Adjust to recent gnulib changes.

* lib/.cvsignore: Add fchownat.c, rmt-command.h, strerror.c, string.h,
string_.h, sys, sys_time_.h, unistd_.h, wchar_.h, wctype_.h.
Remove localedir.h, size_max.h, xsize.h.
* src/xheader.c: Don't include stpcpy.h; no longer needed, now that
gnulib string.h defines stpcpy on all platforms.

src/xheader.c

@@ -1,6 +1,6 @@
 /* POSIX extended headers for tar.
 
-   Copyright (C) 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
+   Copyright (C) 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
 
    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
@@ -22,7 +22,6 @@
 #include <hash.h>
 #include <inttostr.h>
 #include <quotearg.h>
-#include <stpcpy.h>
 
 #include "common.h"