Update libvpx snapshot to v0.9.7-p1 (Cayuga).

source/libvpx/examples/encoder_tmpl.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 93 matching lines @@
     mem_put_le32(header+8, pts >> 32);
 
     if(fwrite(header, 1, 12, outfile));
 }
 
 int main(int argc, char **argv) {
     FILE                *infile, *outfile;
     vpx_codec_ctx_t      codec;
     vpx_codec_enc_cfg_t  cfg;
     int                  frame_cnt = 0;
-    unsigned char        file_hdr[IVF_FILE_HDR_SZ];
-    unsigned char        frame_hdr[IVF_FRAME_HDR_SZ];
     vpx_image_t          raw;
     vpx_codec_err_t      res;
     long                 width;
     long                 height;
     int                  frame_avail;
     int                  got_data;
     int                  flags = 0;
 @@@@TWOPASS_VARS
 
     /* Open files */
@@ skipping 53 matching lines @@
 
     printf("Processed %d frames.\n",frame_cnt-1);
 @@@@DESTROY
 
     /* Try to rewrite the file header with the actual frame count */
     if(!fseek(outfile, 0, SEEK_SET))
         write_ivf_file_header(outfile, &cfg, frame_cnt-1);
     fclose(outfile);
     return EXIT_SUCCESS;
 }