libvpx: Pull from upstream

source/libvpx/test/simple_decoder.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 14 matching lines @@
 }
 
 # Runs simple_decoder using $1 as input file. $2 is the codec name, and is used
 # solely to name the output file.
 simple_decoder() {
   local decoder="${LIBVPX_BIN_PATH}/simple_decoder${VPX_TEST_EXE_SUFFIX}"
   local input_file="$1"
   local codec="$2"
   local output_file="${VPX_TEST_OUTPUT_DIR}/simple_decoder_${codec}.raw"
 
-  [ -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
 }
 
 simple_decoder_vp8() {
   if [ "$(vp8_decode_available)" = "yes" ]; then
     simple_decoder "${VP8_IVF_FILE}" vp8 || return 1
   fi
 }
 
 simple_decoder_vp9() {
   if [ "$(vp9_decode_available)" = "yes" ]; then
     simple_decoder "${VP9_IVF_FILE}" vp9 || return 1
   fi
 }
 
 simple_decoder_tests="simple_decoder_vp8
                       simple_decoder_vp9"
 
 run_tests simple_decoder_verify_environment "${simple_decoder_tests}"