* configure.host (abi_baseline_subdir_switch): Describe.

	* configure.host (abi_baseline_subdir_switch): Describe.
	Provide default.
	(*-*-solaris2.[89], *-*-solaris2.1[0-9]): Override.
	* acinclude.m4 (GLIBCXX_CONFIGURE_TESTSUITE): Substitute
	baseline_subdir_switch.
	* testsuite/Makefile.am (site.exp): Emit it.
	(baseline_subdir): Use it.
	* testsuite/libstdc++-abi/abi.exp: Use it.
	* configure: Regenerate.
	* Makefile.in: Regenerate.
	* doc/Makefile.in: Regenerate.
	* include/Makefile.in: Regenerate.
	* libsupc++/Makefile.in: Regenerate.
	* po/Makefile.in: Regenerate.
	* python/Makefile.in: Regenerate.
	* src/Makefile.in: Regenerate.
	* testsuite/Makefile.in: Regenerate.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@176032 138bc75d-0d04-0410-961f-82ee72b054a4