Port Bug 1246881 - Generate a header defining MOZ_BUILDID for c-c. rs=bustage=fix

client.mk

@@ -266,7 +266,7 @@ profiledbuild::
 ifdef MOZ_UNIFY_BDATE
 ifndef MOZ_BUILD_DATE
 ifdef MOZ_BUILD_PROJECTS
-MOZ_BUILD_DATE = $(shell $(PYTHON) $(TOPSRCDIR)/mozilla/toolkit/xre/make-platformini.py --print-buildid)
+MOZ_BUILD_DATE = $(shell $(PYTHON) $(TOPSRCDIR)/build/variables.py buildid_header | awk '{print $$3}')
 export MOZ_BUILD_DATE
 endif
 endif