Enable lunch command to pick up new toolchain version.

Otherwise the previously exported value will be sticky and the value
defined in the TARGET makefile is ignored.

Change-Id: Icdacb8c46034b8a24a9875b7596b31d00861512a
diff --git a/CleanSpec.mk b/CleanSpec.mk
index 59b7d68..998be2a 100644
--- a/CleanSpec.mk
+++ b/CleanSpec.mk
@@ -152,6 +152,12 @@
 
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/build.prop)
 
+# GCC 4.7
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj/STATIC_LIBRARIES)
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj/SHARED_LIBRARIES)
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj/EXECUTABLES)
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj/lib/*.o)
+
 # ************************************************
 # NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST
 # ************************************************