Adding video_common to libyuv include list

Review URL: http://webrtc-codereview.appspot.com/331018

git-svn-id: http://libyuv.googlecode.com/svn/trunk@121 16f28f9a-4ce2-e073-06de-1de4eb20be90

include/libyuv.h

@@ -20,5 +20,5 @@
 #include "libyuv/planar_functions.h"
 #include "libyuv/rotate.h"
 #include "libyuv/scale.h"
-
+#include "libyuv/video_common.h"
 #endif  // LIBYUV_INCLUDE_LIBYUV_H_