Patch to allow failing of test 27. This is needed in order to stay compatible with automake 1.11

Reference: http://lists.gnu.org/archive/html/autoconf/2009-07/msg00048.html

diff -ur autoconf-2.63/tests/tools.at autoconf-2.63.patched//tests/tools.at
--- autoconf-2.63/tests/tools.at	2008-08-22 14:05:31.000000000 +0200
+++ autoconf-2.63.patched//tests/tools.at	2009-07-17 22:43:33.000000000 +0200
@@ -946,6 +946,7 @@
 # We use aclocal and automake.
 AT_CHECK([automake --version || exit 77], [], [ignore], [ignore])
 AT_CHECK([test ! -f $HOME/.autom4te.cfg || exit 77], [], [ignore], [ignore])
+AT_XFAIL_IF([:])
 
 AT_DATA([configure.in],
 [[AC_INIT(GNU foo, 1.0)