post process the system properties

Change-Id: Ib78fe238d90dd4523326e4fa088d9333edc9e299

core/Makefile

@@ -51,6 +51,7 @@ $(INSTALLED_DEFAULT_PROP_TARGET):
 	        echo "#" >> $@;
 	$(hide) $(foreach line,$(ADDITIONAL_DEFAULT_PROPERTIES), \
 		echo "$(line)" >> $@;)
+	build/tools/post_process_props.py $@
 
 # -----------------------------------------------------------------
 # build.prop
@@ -161,6 +162,7 @@ $(INSTALLED_BUILD_PROP_TARGET): $(BUILDINFO_SH) $(INTERNAL_BUILD_ID_MAKEFILE) $(
 		        echo "#" >> $@; )
 	$(hide) $(foreach line,$(ADDITIONAL_BUILD_PROPERTIES), \
 		echo "$(line)" >> $@;)
+	$(hide) build/tools/post_process_props.py $@
 
 build_desc :=