Bug 1211957 - Add the repackage step at the end of a faster build on Mac. r=gps

That is necessary until bug 934070 is fixed

config/faster/rules.mk

@@ -53,6 +53,12 @@ default: $(TOPOBJDIR)/dist/bin/webapprt/webapprt.ini
 # Targets from the recursive make backend to be built for a default build
 default: $(TOPOBJDIR)/config/makefiles/xpidl/xpidl
 
+ifeq (cocoa,$(MOZ_WIDGET_TOOLKIT))
+# Mac builds require to copy things in dist/bin/*.app
+default:
+	$(MAKE) -C $(TOPOBJDIR)/$(MOZ_BUILD_APP)/app repackage
+endif
+
 .PHONY: FORCE
 
 # Extra define to trigger some workarounds. We should strive to limit the

python/mozbuild/mozbuild/backend/fastermake.py

@@ -188,6 +188,8 @@ class FasterMakeBackend(CommonBackend):
             'PYTHON',
             'ACDEFINES',
             'MOZ_CHROME_FILE_FORMAT',
+            'MOZ_BUILD_APP',
+            'MOZ_WIDGET_TOOLKIT',
         ):
             mk.add_statement('%s = %s' % (var, self.environment.substs[var]))