libvpx: Pull from upstream

source/libvpx/examples/vp8cx_set_ref.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.
  */
 
@@ skipping 40 matching lines @@
 #include <string.h>
 
 #include "vpx/vp8cx.h"
 #include "vpx/vpx_encoder.h"
 
 #include "../tools_common.h"
 #include "../video_writer.h"
 
 static const char *exec_name;
 
-void usage_exit() {
+void usage_exit(void) {
   fprintf(stderr, "Usage: %s <width> <height> <infile> <outfile> <frame>\n",
           exec_name);
   exit(EXIT_FAILURE);
 }
 
 static int encode_frame(vpx_codec_ctx_t *codec,
                         vpx_image_t *img,
                         int frame_index,
                         VpxVideoWriter *writer) {
   int got_pkts = 0;
@@ skipping 113 matching lines @@
   printf("Processed %d frames.\n", frame_count);
 
   vpx_img_free(&raw);
   if (vpx_codec_destroy(&codec))
     die_codec(&codec, "Failed to destroy codec.");
 
   vpx_video_writer_close(writer);
 
   return EXIT_SUCCESS;
 }