Fix dom binding test makefile to actually work right. r=khuey, no bug

dom/bindings/test/Makefile.in

@@ -49,6 +49,10 @@ bindinggen_dependencies := \
   $(GLOBAL_DEPS) \
   $(NULL)
 
+# Include rules.mk before any of our targets so our first target is coming from
+# rules.mk and running make with no target in this dir does the right thing.
+include $(topsrcdir)/config/rules.mk
+
 $(CPPSRCS): ../%Binding.cpp: $(bindinggen_dependencies) \
                              ../%.webidl \
                              $(NULL)
@@ -65,8 +69,6 @@ MOCHITEST_FILES = \
   $(NULL)
 
 
-include $(topsrcdir)/config/rules.mk
-
 check::
 	PYTHONDONTWRITEBYTECODE=1 $(PYTHON) $(topsrcdir)/config/pythonpath.py \
 	  $(PLY_INCLUDE) $(srcdir)/../parser/runtests.py