Bug 1441791 - Use MOZILLA_DIR when including from mozilla topsrcdir. r=ted

MozReview-Commit-ID: 47Euw1vkVw6

--HG--
extra : rebase_source : b0aea1a50673f6b74b5086515ae35ab54af9d57e

config/config.mk

@@ -339,7 +339,7 @@ sysinstall_cmd = install_cmd
 # overridden by the command line. (Besides, AB_CD is prettier).
 AB_CD = $(MOZ_UI_LOCALE)
 
-include $(topsrcdir)/config/AB_rCD.mk
+include $(MOZILLA_DIR)/config/AB_rCD.mk
 
 # Many locales directories want this definition.
 ACDEFINES += -DAB_CD=$(AB_CD)