Bug 717616 - cleanup empty jsloader & jssubloader dirs after generating cache, they end up in the package otherwise - r=glandium

toolkit/mozapps/installer/packager.mk

@@ -498,7 +498,8 @@ GENERATE_CACHE = \
   rm -rf jsloader jssubloader && \
   $(UNZIP) -q startupCache.zip && \
   rm startupCache.zip && \
-  $(ZIP) -r9m $(OMNIJAR_NAME) jsloader/resource/$(PRECOMPILE_RESOURCE) jssubloader/*/resource/$(PRECOMPILE_RESOURCE)
+  $(ZIP) -r9m $(OMNIJAR_NAME) jsloader/resource/$(PRECOMPILE_RESOURCE) jssubloader/*/resource/$(PRECOMPILE_RESOURCE) && \
+  rm -rf jsloader jssubloader
 else
 GENERATE_CACHE = true
 endif