0.9.4.12:

0.9.4.12:
	Test fixes:
	 * make sure we don't use :darwin when we mean (:and :ppc :darwin)
	 * enable a test which passes on Darwin but was previously
	   commented out (possibly due to insufficient memory space?)
	 * use with-test to turn a floating-point traps test into an
	   expected failure on PPC Darwin, where floating-point traps are not
	   enabled.