build: avoid locale-specific changes in generated, VC'd file

build: avoid locale-specific changes in generated, VC'd file

When I build with LC_ALL=C in my environment,
the all-local rule generates po/POTFILES.in that
is sorted differently from the on that is checked in:

    diff --git a/po/POTFILES.in b/po/POTFILES.in
    index ca01b3d..154915a 100644
    --- a/po/POTFILES.in
    +++ b/po/POTFILES.in
    @@ -63,12 +63,11 @@ fish/tilde.c
     fish/time.c
     inspector/virt-inspector.pl
     java/com_redhat_et_libguestfs_GuestFS.c
    -ocaml/guestfs_c_actions.c
     ocaml/guestfs_c.c
    +ocaml/guestfs_c_actions.c
     perl/bindtests.pl
    -perl/Guestfs.c
    -perl/lib/Sys/Guestfs/Lib.pm
     perl/lib/Sys/Guestfs.pm
    +perl/lib/Sys/Guestfs/Lib.pm
     python/guestfs-py.c
     ruby/ext/guestfs/_guestfs.c
     src/guestfs-actions.c

If we generate that file so that sort always uses the C locale, then,
this type of difference will not arise.  Here's the patch to fix the
rule as well as to reflect the change in the generated file:

>From 609e1d1840da25614a7c9e8954e5356050c9f2ad Mon Sep 17 00:00:00 2001
From: Jim Meyering <meyering@redhat.com>
Date: Wed, 29 Jul 2009 08:13:35 -0400
Subject: [PATCH] build: avoid locale-specific changes in generated, VC'd file

* Makefile.am (all-local): Use LC_ALL=C to sort in C locale.
* po/POTFILES.in: Regenerate.