Try to build tinytest.obj from the right sources

src/test/Makefile.nmake

@@ -18,6 +18,9 @@ TEST_OBJECTS = test.obj test_addr.obj test_containers.obj \
 tinytest.obj: ..\ext\tinytest.c
 	$(CC) $(CFLAGS) /D snprintf=_snprintf /c ..\ext\tinytest.c
 
+tinytest.obj: ..\ext\tinytest.c
+	$(CC) $(CFLAGS) /c ..\exe\tinytest.c
+
 test.exe: $(TEST_OBJECTS)
 	$(CC) $(CFLAGS) $(LIBS) ..\common\*.lib $(TEST_OBJECTS) /Fe$@