Add dalvik.vm.dex2oat-flags for eng build

Bug: 12869646
Change-Id: I794320267c846225931f12075c7f32d7848081e9
diff --git a/CleanSpec.mk b/CleanSpec.mk
index ee85995..17fd5d6 100644
--- a/CleanSpec.mk
+++ b/CleanSpec.mk
@@ -217,6 +217,9 @@
 # Add ro.product.cpu.abilist{32,64} to build.prop.
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/build.prop)
 
+# Adding dalvik.vm.dex2oat-flags to eng builds
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/build.prop)
+
 # ************************************************
 # NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST
 # ************************************************