Add tests-static to tests in malloc/Makefile

This is a trivial change to add the static tests only to tests-static
and then adding all of tests-static to the tests target to make it
look consistent with some other Makefiles.  This avoids having to
duplicate the test names across the two make targets.

	* malloc/Makefile (tests): Remove individual static test names
	and just add all of tests-static.