Revert "retire android_native_window_t"

this type is still used by partner's source trees.
we will get rid of it in next release's timeframe.

This reverts commit 7b49b976277cb3538242151e7dbd24681ddec73e.

include/ui/egl/android_natives.h

@@ -291,6 +291,9 @@ struct ANativeWindow
     void* reserved_proc[2];
 };
 
+// Backwards compatibility...  please switch to ANativeWindow.
+typedef struct ANativeWindow android_native_window_t;
+
 /*
  *  native_window_set_usage(..., usage)
  *  Sets the intended usage flags for the next buffers