Update gnulib

This updates gnulib to a relatively recent commit.  Most of this was
done by the gnulib import script; the only change I made was to
update-gnulib.sh.

Tested on x86-64 Fedora 34.  I also did a mingw cross build.

gnulib/import/chown.c

@@ -1,19 +1,19 @@
 /* provide consistent interface to chown for systems that don't interpret
    an ID of -1 as meaning "don't change the corresponding ID".
 
-   Copyright (C) 1997, 2004-2007, 2009-2021 Free Software Foundation, Inc.
+   Copyright (C) 1997, 2004-2007, 2009-2022 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 Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file 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.
+   GNU Lesser General Public License for more details.
 
-   You should have received a copy of the GNU General Public License
+   You should have received a copy of the GNU Lesser General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 /* written by Jim Meyering */
@@ -33,8 +33,8 @@
 
 /* Simple stub that always fails with ENOSYS, for mingw.  */
 int
-chown (const char *file _GL_UNUSED, uid_t uid _GL_UNUSED,
-       gid_t gid _GL_UNUSED)
+chown (_GL_UNUSED const char *file, _GL_UNUSED uid_t uid,
+       _GL_UNUSED gid_t gid)
 {
   errno = ENOSYS;
   return -1;