Make build warnings be errors

Change-Id: Ia9e32a36f5c0268c8e85ebf25168821d8ad0162d
diff --git a/services/audioflinger/tests/Android.mk b/services/audioflinger/tests/Android.mk
index 6182de0..3505e0f 100644
--- a/services/audioflinger/tests/Android.mk
+++ b/services/audioflinger/tests/Android.mk
@@ -23,6 +23,8 @@
 LOCAL_MODULE := resampler_tests
 LOCAL_MODULE_TAGS := tests
 
+LOCAL_CFLAGS := -Werror -Wall
+
 include $(BUILD_NATIVE_TEST)
 
 #
@@ -61,4 +63,6 @@
 
 LOCAL_CXX_STL := libc++
 
+LOCAL_CFLAGS := -Werror -Wall
+
 include $(BUILD_EXECUTABLE)