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/services/surfaceflinger/LayerRejecter.cpp b/services/surfaceflinger/LayerRejecter.cpp
index 2bc0605..5ca7d39 100644
--- a/services/surfaceflinger/LayerRejecter.cpp
+++ b/services/surfaceflinger/LayerRejecter.cpp
@@ -16,6 +16,8 @@
 
 #include "LayerRejecter.h"
 
+#include <gui/BufferItem.h>
+
 #include "clz.h"
 
 #define DEBUG_RESIZE 0
@@ -123,4 +125,4 @@
     return false;
 }
 
-}  // namespace android
\ No newline at end of file
+}  // namespace android