Run selftests for C++ as well as C

Run selftests for C++ as well as C

gcc/ChangeLog:
	* Makefile.in (SELFTEST_TARGETS): New.
	(selftest) Change from s-selftest-c to $(SELFTEST_TARGETS).
	(C_SELFTEST_FLAGS, C_SELFTEST_DEPS, s-selftest-c, selftest-c-gdb)
	(selftest-gdb, selftest-c-valgrind, selftest-valgrind): Move to
	c/Make-lang.in.
	(CPP_SELFTEST_FLAGS, CPP_SELFTEST_DEPS, s-selftest-c++)
	(selftest-c++-gdb, selftest-c++-valgrind): Move to
	cp/Make-lang.in.
	* configure: Regenerate.
	* configure.ac (selftest_languages): New.

gcc/brig/ChangeLog:
	* Make-lang.in (selftest-brig): New.

gcc/c/ChangeLog:
	* Make-lang.in (selftest-c): New.
	(C_SELFTEST_FLAGS, C_SELFTEST_DEPS, s-selftest-c, selftest-c-gdb)
	(selftest-gdb, selftest-c-valgrind, selftest-valgrind): Move here
	from gcc/Makefile.in.

gcc/cp/ChangeLog:
	* Make-lang.in (selftest-c++): New.
	(CPP_SELFTEST_FLAGS, CPP_SELFTEST_DEPS, s-selftest-c++)
	(selftest-c++-gdb, selftest-c++-valgrind): Move here from
	gcc/Makefile.in.

gcc/fortran/ChangeLog:
	* Make-lang.in (selftest-fortran): New.

gcc/go/ChangeLog:
	* Make-lang.in (selftest-go): New.

gcc/jit/ChangeLog:
	* Make-lang.in (selftest-jit): New.

gcc/lto/ChangeLog:
	* Make-lang.in (selftest-lto): New.

gcc/objc/ChangeLog:
	* Make-lang.in (selftest-objc): New.

gcc/objcp/ChangeLog:
	* Make-lang.in (selftest-obj-c++): New.

From-SVN: r265240