diffutils test failure on nixos/hydra's solaris build

[Jim Meyering]

I noticed that the autobuilder failed only on solaris:

    http://hydra.nixos.org/build/2976390/log/raw

At first, I misdiagnosed it as a failure in another test (but that was
merely a skip), committed the following and immediately reverted it.

    From 1c38788efee7ca9afb6d3a857c95dfd1b5f2d03b Mon Sep 17 00:00:00 2001
    From: Jim Meyering <meyer...@redhat.com>
    Date: Tue, 28 Aug 2012 13:49:37 +0200
    Subject: [PATCH] tests: test-vc-list-files-git.sh: skip if git is not
       available

The real failure was here:

    FAIL: test-localeconv (exit: 262)
    =================================

    test-localeconv.c:41: assertion failed

which corresponds to this line:

    $ cat -n tests/test-localeconv.c|grep -B6 41
        35    {
        36      struct lconv *l = localeconv ();
        37
        38      ASSERT (STREQ (l->decimal_point, "."));
        39      ASSERT (STREQ (l->thousands_sep, ""));
        40  #if !defined __FreeBSD__
        41      ASSERT (STREQ (l->grouping, ""));

Since that same test passes just fine on a Solaris 10 system
to which I have access, I'm going to ignore it for now.