libvpx: Pull from upstream

source/libvpx/vp9/encoder/vp9_bitstream.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 11 matching lines @@
 
 void vp9_pack_bitstream(VP9_COMP *cpi, uint8_t *dest, size_t *size);
 
 static INLINE int vp9_preserve_existing_gf(VP9_COMP *cpi) {
   return !cpi->multi_arf_allowed && cpi->refresh_golden_frame &&
          cpi->rc.is_src_frame_alt_ref &&
          (!cpi->use_svc ||      // Add spatial svc base layer case here
           (is_two_pass_svc(cpi) &&
            cpi->svc.spatial_layer_id == 0 &&
            cpi->svc.layer_context[0].gold_ref_idx >=0 &&
-           cpi->oxcf.ss_play_alternate[0]));
+           cpi->oxcf.ss_enable_auto_arf[0]));
 }
 
 #ifdef __cplusplus
 }  // extern "C"
 #endif
 
 #endif  // VP9_ENCODER_VP9_BITSTREAM_H_