Fail when PPL 0.11 is not present and CLooG has been requested.

2011-01-25  Sebastian Pop  <sebastian.pop@amd.com>

	* configure.ac: Call AC_MSG_ERROR when PPL 0.11 is not present and
	CLooG has been requested.
	* configure: Regenerated.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@169215 138bc75d-0d04-0410-961f-82ee72b054a4