[PATCH, libstdc++] Make abi_check multilib-aware

[Benjamin Kosnik]

> 	* 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.

This is ok, thanks.

-benjamin