run-as: turn on -Werror

- remove an abandoned code fragment

Change-Id: I32d4ad820772685c680d200dc00ef11d102c76bd
diff --git a/run-as/Android.mk b/run-as/Android.mk
index a8f2885..3774acc 100644
--- a/run-as/Android.mk
+++ b/run-as/Android.mk
@@ -1,10 +1,12 @@
 LOCAL_PATH:= $(call my-dir)
 include $(CLEAR_VARS)
 
-LOCAL_SRC_FILES:= run-as.c package.c
+LOCAL_SRC_FILES := run-as.c package.c
 
 LOCAL_SHARED_LIBRARIES := libselinux
 
-LOCAL_MODULE:= run-as
+LOCAL_MODULE := run-as
+
+LOCAL_CFLAGS := -Werror
 
 include $(BUILD_EXECUTABLE)