Bug 678479: Add a makefile target in xpcom/ to regenerate the IDL parser. r=ted

xpcom/Makefile.in

@@ -90,3 +90,9 @@ endif
 
 include $(topsrcdir)/config/rules.mk
 
+regenerate-idl-parser:
+	$(PYTHON_PATH) \
+	  -I$(topsrcdir)/other-licenses/ply \
+	  -I$(topsrcdir)/xpcom/idl-parser \
+	  $(topsrcdir)/xpcom/idl-parser/header.py --cachedir=$(topsrcdir)/xpcom/idl-parser --regen
+