libvpx: Pull from upstream

source/libvpx/vp9/encoder/vp9_encodemb.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.
  */
 
@@ skipping 15 matching lines @@
                         BLOCK_SIZE plane_bsize, TX_SIZE tx_size);
 void vp9_xform_quant_dc(MACROBLOCK *x, int plane, int block,
                         BLOCK_SIZE plane_bsize, TX_SIZE tx_size);
 void vp9_xform_quant(MACROBLOCK *x, int plane, int block,
                      BLOCK_SIZE plane_bsize, TX_SIZE tx_size);
 
 void vp9_subtract_plane(MACROBLOCK *x, BLOCK_SIZE bsize, int plane);
 
 void vp9_encode_block_intra(MACROBLOCK *x, int plane, int block,
                             BLOCK_SIZE plane_bsize, TX_SIZE tx_size,
-                            unsigned char *skip);
+                            int8_t *skip);
 
 void vp9_encode_intra_block_plane(MACROBLOCK *x, BLOCK_SIZE bsize, int plane);
 
 #ifdef __cplusplus
 }  // extern "C"
 #endif
 
 #endif  // VP9_ENCODER_VP9_ENCODEMB_H_