* testsuite/libstdc++-abi/abi.exp: Add multilib support.
	* acinclude.m4 (GLIBCXX_CONFIGURE_TESTSUITE): Remove MULTISUBDIR
	from baseline_dir.
	* configure: Regenerate.
	* testsuite/Makefile.am (baseline_file): Remove variable.
	(site.exp): Set baseline_dir rather than baseline_file.
	(check-abi): Pass AM_RUNTESTFLAGS and RUNTESTFLAGS to runtest.
	* testsuite/Makefile.in: Regenerate.

From-SVN: r144394