using git Libtool with Autoconf 2.59, Automake 1.9.6

[Ralf Wildenhues]

I tried running the Libtool test suites with old Autoconf 2.59 and
Automake 1.9.6 (on GNU/Linux only) after 'autoreconf -fvi'-ing all
but the toplevel directory with those tools.  I was surprised to see
that it still works more or less!  :-)

This patch fixes the fall-out.  OK to push if the use of $at_status is
sanctioned?
<http://thread.gmane.org/gmane.comp.sysutils.autoconf.patches/7323>

Thanks,
Ralf

    Fix getopt tests to skip with Autoconf < 2.61.
    
    * tests/getopt-m4sh.at (_LT_AT_GETOPT_M4SH_SETUP): Skip the test
    of 'autom4te --language=m4sh' exits 63 because version 2.61 is
    required.  Allows the testsuite to complete successfully with
    Autoconf 2.59 and Automake 1.9.6.

diff --git a/tests/getopt-m4sh.at b/tests/getopt-m4sh.at
index 3e58db1..d2df827 100644
--- a/tests/getopt-m4sh.at
+++ b/tests/getopt-m4sh.at
@@ -48,12 +48,9 @@ M4SH_GETOPTS(
 ]])
 m4_pattern_forbid([m4_include])
 m4_pattern_forbid([AS_INIT])
-
-$M4SH -B $abs_top_srcdir/libltdl/config options.m4sh \
-    | $SED \
-       -e "s,@LN_S\@,$LN_S,g" \
-       -e "s,@SED\@,$SED,g" \
-    > options
+AT_CHECK([$M4SH -B $abs_top_srcdir/libltdl/config options.m4sh > t-options],
+        [], [], [], [AT_CHECK([test $at_status -eq 63 && exit 77])])
+$SED "s,@LN_S\@,$LN_S,g;s,@SED\@,$SED,g" t-options > options
 ])# _LT_AT_GETOPT_M4SH_SETUP