* Makefile.in (check-gcc//%, check-g++//%, check-g77//%,
check-objc//%): Support parallel testing of multilibs.
(TESTSUITEDIR): Set to testsuite by default, but override for
parallel testing.
(check-gcc, check-g++, check-g77, check-objc): Enter
$(TESTSUITEDIR).

From-SVN: r38909