Use the fact that tests end in _test in pattern

Author: WardBrian

make/tests

@@ -34,7 +34,7 @@ test/%$(EXE) : test/%.o $(GTEST)/src/gtest_main.cc $(GTEST)/src/gtest-all.o $(MP
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 ifneq ($(filter test/%,$(MAKECMDGOALS)),)
 -include $(patsubst %$(EXE),%.d,$(filter test/%,$(MAKECMDGOALS)))
-.INTERMEDIATE: $(patsubst %$(EXE),%.o,$(filter-out test/%.d test/%.o,$(filter test/%,$(MAKECMDGOALS))))
+.INTERMEDIATE: $(patsubst test/%_test$(EXE),test/%_test.o,$(filter test/%_test$(EXE),$(MAKECMDGOALS)))
 endif
 
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