Expect at least the version 0.11 of PPL.

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

toplev/
	* configure: Regenerated.
	* configure.ac: Check for version 0.11 (or later revision) of PPL.

toplev/gcc/
	* doc/install.texi: Update the expected version number of PPL to 0.11.
	* graphite-ppl.c (ppl_powerset_is_empty): Remove now dead code under
	#if PPL_VERSION_MINOR < 11.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@169207 138bc75d-0d04-0410-961f-82ee72b054a4