Obviously JB MR1.1 should be Android 4.2.2.

Change-Id: I148817d22d50672a7f204809d11aaf7f0a8af28b
diff --git a/CleanSpec.mk b/CleanSpec.mk
index f4d45ff..59b7d68 100644
--- a/CleanSpec.mk
+++ b/CleanSpec.mk
@@ -150,6 +150,8 @@
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/app/*)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj/APPS/*)
 
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/build.prop)
+
 # ************************************************
 # NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST
 # ************************************************