libvpx: Pull from upstream

source/libvpx/vp9/common/vp9_quant_common.h

 /*
  *  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.
  */
 
 #ifndef VP9_COMMON_VP9_QUANT_COMMON_H_
 #define VP9_COMMON_VP9_QUANT_COMMON_H_
 
 #include "vp9/common/vp9_blockd.h"
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 #define MINQ 0
 #define MAXQ 255
 #define QINDEX_RANGE (MAXQ - MINQ + 1)
 #define QINDEX_BITS 8
 
 void vp9_init_quant_tables();
 
 int16_t vp9_dc_quant(int qindex, int delta);
 int16_t vp9_ac_quant(int qindex, int delta);
 
-int vp9_get_qindex(struct segmentation *seg, int segment_id, int base_qindex);
+int vp9_get_qindex(const struct segmentation *seg, int segment_id,
+                   int base_qindex);
 
 #ifdef __cplusplus
 }  // extern "C"
 #endif
 
 #endif  // VP9_COMMON_VP9_QUANT_COMMON_H_