Integrate dexpreopt into the build system.

Change-Id: Id67f85d0f5c8674f5bc22e431114ca73625811ef
diff --git a/core/base_rules.mk b/core/base_rules.mk
index db05e00..f372748 100644
--- a/core/base_rules.mk
+++ b/core/base_rules.mk
@@ -492,6 +492,16 @@
 	$(copy-file-to-target-with-cp)
 endif
 
+ifeq ($(LOCAL_DEX_PREOPT),true)
+installed_odex := $(basename $(LOCAL_INSTALLED_MODULE)).odex
+built_odex := $(basename $(LOCAL_BUILT_MODULE)).odex
+$(installed_odex) : $(built_odex) | $(ACP)
+	@echo "Install: $@"
+	$(copy-file-to-target)
+
+$(LOCAL_INSTALLED_MODULE): $(installed_odex)
+endif
+
 endif # !LOCAL_UNINSTALLABLE_MODULE