Fix proguard flag file dependency.

Change-Id: I32004f93fe66f54647f1c93125425a9646431070
diff --git a/Android.mk b/Android.mk
index 2eb779a..83df136 100644
--- a/Android.mk
+++ b/Android.mk
@@ -8,7 +8,7 @@
 LOCAL_PACKAGE_NAME := Settings
 LOCAL_CERTIFICATE := platform
 
-LOCAL_PROGUARD_FLAGS := -include $(LOCAL_PATH)/proguard.flags
+LOCAL_PROGUARD_FLAG_FILES := proguard.flags
 
 include $(BUILD_PACKAGE)