Make build warnings be errors

Change-Id: Ia9e32a36f5c0268c8e85ebf25168821d8ad0162d
diff --git a/services/medialog/Android.mk b/services/medialog/Android.mk
index 411f80f..88f98cf 100644
--- a/services/medialog/Android.mk
+++ b/services/medialog/Android.mk
@@ -12,4 +12,6 @@
 
 LOCAL_C_INCLUDES := $(call include-path-for, audio-utils)
 
+LOCAL_CFLAGS := -Werror -Wall
+
 include $(BUILD_SHARED_LIBRARY)