[RFA/commit 2/2] Import gnulib's errno module.

[Joel Brobecker]

> This module is needed in order to build GDBserver on ppc-lynx178,
> because the system does not define EILSEQ.

Attached is the updated patch which I just checked in.
The difference comes from the fact that patch #1 was replaced with
an update to gnulib's current HEAD, rather than a specific revision
in the past.

gdb/ChangeLog:

        * gnulib/update-gnulib.sh (IMPORTED_GNULIB_MODULES): Add errno.
        * gnulib/import/errno.in.h: Import.
        * gnulib/import/m4/errno_h.m4: Import.
        * gnulib/aclocal.m4: Regenerate.
        * gnulib/configure: Regenerate.
        * gnulib/import/Makefile.am: Update.
        * gnulib/import/Makefile.in: Update.
        * gnulib/import/m4/gnulib-cache.m4: Update.
        * gnulib/import/m4/gnulib-comp.m4: Update.

Tested on x86_64-linux and ppc-lynx178.  Checked in.

-- 
Joel