Break a dependency of libui on libandroid

This was only a header dependency, but it still
created a circular dependency, which will cause
problems in another CL.

We fix this by creating a libarect static library
containing only that header. both libui and
libandroid now depend on it and reexport the 
header. 

We also make sure rect.h ends-up in the right
place.

Test: built and booted device
Bug: 35164655

Change-Id: Iba25b8b801b26b26ec1401c00caf367a06f197ca
diff --git a/include/gui/GLConsumer.h b/include/gui/GLConsumer.h
index 4a49f53..51d7666 100644
--- a/include/gui/GLConsumer.h
+++ b/include/gui/GLConsumer.h
@@ -20,8 +20,7 @@
 #include <EGL/egl.h>
 #include <EGL/eglext.h>
 
-#include <gui/IGraphicBufferProducer.h>
-#include <gui/BufferQueue.h>
+#include <gui/BufferQueueDefs.h>
 #include <gui/ConsumerBase.h>
 
 #include <ui/GraphicBuffer.h>
@@ -489,7 +488,7 @@
     // slot that has not yet been used. The buffer allocated to a slot will also
     // be replaced if the requested buffer usage or geometry differs from that
     // of the buffer allocated to a slot.
-    EglSlot mEglSlots[BufferQueue::NUM_BUFFER_SLOTS];
+    EglSlot mEglSlots[BufferQueueDefs::NUM_BUFFER_SLOTS];
 
     // mCurrentTexture is the buffer slot index of the buffer that is currently
     // bound to the OpenGL texture. It is initialized to INVALID_BUFFER_SLOT,