Replace custom rules with BUILD_PREBUILT

Change-Id: I9910c109d0d8cde7c4366f2985fe6ded7294f251
diff --git a/tools/cfassembler/Android.mk b/tools/cfassembler/Android.mk
index 8e0f351..df736ed 100644
--- a/tools/cfassembler/Android.mk
+++ b/tools/cfassembler/Android.mk
@@ -22,14 +22,9 @@
 LOCAL_IS_HOST_MODULE := true
 LOCAL_MODULE_CLASS := EXECUTABLES
 LOCAL_MODULE := cfassembler
-
-include $(BUILD_SYSTEM)/base_rules.mk
-
-$(LOCAL_BUILT_MODULE): $(HOST_OUT_JAVA_LIBRARIES)/cfassembler$(COMMON_JAVA_PACKAGE_SUFFIX)
-$(LOCAL_BUILT_MODULE): $(LOCAL_PATH)/etc/cfassembler | $(ACP)
-	@echo "Copy: $(PRIVATE_MODULE) ($@)"
-	$(copy-file-to-new-target)
-	$(hide) chmod 755 $@
+LOCAL_SRC_FILES := etc/cfassembler
+LOCAL_ADDITIONAL_DEPENDENCIES := $(HOST_OUT_JAVA_LIBRARIES)/cfassembler$(COMMON_JAVA_PACKAGE_SUFFIX)
+include $(BUILD_PREBUILT)
 
 INTERNAL_DALVIK_MODULES += $(LOCAL_INSTALLED_MODULE)