Re-allow direct building of .o files with filter-out

Author: WardBrian

make/tests

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