Make build warnings be errors

Change-Id: Ia9e32a36f5c0268c8e85ebf25168821d8ad0162d
diff --git a/services/audioflinger/Android.mk b/services/audioflinger/Android.mk
index 0112e56..6700f6e 100644
--- a/services/audioflinger/Android.mk
+++ b/services/audioflinger/Android.mk
@@ -80,6 +80,8 @@
 
 LOCAL_CFLAGS += -fvisibility=hidden
 
+LOCAL_CFLAGS += -Werror -Wall
+
 include $(BUILD_SHARED_LIBRARY)
 
 #
@@ -108,6 +110,8 @@
 
 LOCAL_MODULE_TAGS := optional
 
+LOCAL_CFLAGS := -Werror -Wall
+
 include $(BUILD_EXECUTABLE)
 
 include $(CLEAR_VARS)
@@ -128,6 +132,8 @@
 
 LOCAL_MODULE := libaudioresampler
 
+LOCAL_CFLAGS := -Werror -Wall
+
 # uncomment to disable NEON on architectures that actually do support NEON, for benchmarking
 #LOCAL_CFLAGS += -DUSE_NEON=false