libgui: Enable -Weverything and -Werror

Enables -Weverything and -Werror, with just a few exceptions for
warnings we can't (or shouldn't need to) work around.

Change-Id: I034abec27bf4020d84af60d7acc1939c59986dd6
diff --git a/include/gui/BufferItemConsumer.h b/include/gui/BufferItemConsumer.h
index 5494ff1..869b470 100644
--- a/include/gui/BufferItemConsumer.h
+++ b/include/gui/BufferItemConsumer.h
@@ -95,7 +95,7 @@
     // setDefaultBufferFormat allows the BufferQueue to create
     // GraphicBuffers of a defaultFormat if no format is specified
     // in dequeueBuffer
-    status_t setDefaultBufferFormat(uint32_t defaultFormat);
+    status_t setDefaultBufferFormat(PixelFormat defaultFormat);
 };
 
 } // namespace android