libvpx: Pull from upstream

source/libvpx/vp9/common/vp9_swapyv12buffer.c

 /*
  *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #include "vp9/common/vp9_swapyv12buffer.h"
 
 void vp9_swap_yv12_buffer(YV12_BUFFER_CONFIG *new_frame,
                           YV12_BUFFER_CONFIG *last_frame) {
-  unsigned char *temp;
+  uint8_t *temp;
 
   temp = last_frame->buffer_alloc;
   last_frame->buffer_alloc = new_frame->buffer_alloc;
   new_frame->buffer_alloc = temp;
 
   temp = last_frame->y_buffer;
   last_frame->y_buffer = new_frame->y_buffer;
   new_frame->y_buffer = temp;
 
   temp = last_frame->u_buffer;
   last_frame->u_buffer = new_frame->u_buffer;
   new_frame->u_buffer = temp;
 
   temp = last_frame->v_buffer;
   last_frame->v_buffer = new_frame->v_buffer;
   new_frame->v_buffer = temp;
 }