* testsuite/lib/libstdc++.exp (v3-build_support): Look for

	__GTHREADS, rather than _GLIBCXX_HAVE_GTHR_DEFAULT, to determine
	whether or not thread support is available.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@99256 138bc75d-0d04-0410-961f-82ee72b054a4