libcpustats: Turn on -Werror

- Switch to static_assert from deprecated utils/Debug.h
- Turn on C++11 standard
- Turn on -Werror

Change-Id: I4f1c08bbcaf1ad3a97502cde756a2f42bcece789
diff --git a/media/libcpustats/Android.mk b/media/libcpustats/Android.mk
index b506353..ee283a6 100644
--- a/media/libcpustats/Android.mk
+++ b/media/libcpustats/Android.mk
@@ -1,4 +1,4 @@
-LOCAL_PATH:= $(call my-dir)
+LOCAL_PATH := $(call my-dir)
 
 include $(CLEAR_VARS)
 
@@ -8,4 +8,6 @@
 
 LOCAL_MODULE := libcpustats
 
+LOCAL_CFLAGS := -std=gnu++11 -Werror
+
 include $(BUILD_STATIC_LIBRARY)