2012-09-03  Richard Guenther  <rguenther@suse.de>

	PR bootstrap/54138
	* configure.ac: Re-organize ISL / CLOOG checks to allow
	disabling with either --without-isl or --without-cloog.
	* configure: Regenerated.
	* config/cloog.m4: Adjust.
	* config/isl.m4: Adjust.

From-SVN: r190895