libvpx: Pull from upstream

source/libvpx/test/decode_to_md5.sh

 #!/bin/sh
 ##
 ##  Copyright (c) 2014 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 16 matching lines @@
 # Runs decode_to_md5 on $1 and captures the md5 sum for the final frame. $2 is
 # interpreted as codec name and used solely to name the output file. $3 is the
 # expected md5 sum: It must match that of the final frame.
 decode_to_md5() {
   local decoder="${LIBVPX_BIN_PATH}/decode_to_md5${VPX_TEST_EXE_SUFFIX}"
   local input_file="$1"
   local codec="$2"
   local expected_md5="$3"
   local output_file="${VPX_TEST_OUTPUT_DIR}/decode_to_md5_${codec}"
 
-  [ -x "${decoder}" ] || return 1
+  if [ ! -x "${decoder}" ]; then
+    elog "${decoder} does not exist or is not executable."
+    return 1
+  fi
 
   eval "${decoder}" "${input_file}" "${output_file}" ${devnull}
 
   [ -e "${output_file}" ] || return 1
 
   local md5_last_frame=$(tail -n1 "${output_file}")
   local actual_md5=$(echo "${md5_last_frame% *}" | tr -d [:space:])
   [ "${actual_md5}" = "${expected_md5}" ] || return 1
 }
 
@@ skipping 12 matching lines @@
 
   if [ "$(vp9_decode_available)" = "yes" ]; then
     decode_to_md5 "${VP9_IVF_FILE}" "vp9" "${expected_md5}"
   fi
 }
 
 decode_to_md5_tests="decode_to_md5_vp8
                      decode_to_md5_vp9"
 
 run_tests decode_to_md5_verify_environment "${decode_to_md5_tests}"