libvpx: Pull from upstream

source/libvpx/test/vp8cx_set_ref.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 @@
 # $1 is the codec name, which vp8cx_set_ref does not support at present: It's
 # currently used only to name the output file.
 # TODO(tomfinegan): Pass the codec param once the example is updated to support
 # VP9.
 vpx_set_ref() {
   local encoder="${LIBVPX_BIN_PATH}/vp8cx_set_ref${VPX_TEST_EXE_SUFFIX}"
   local codec="$1"
   local output_file="${VPX_TEST_OUTPUT_DIR}/vp8cx_set_ref_${codec}.ivf"
   local ref_frame_num=90
 
-  [ -x "${encoder}" ] || return 1
+  if [ ! -x "${encoder}" ]; then
+    elog "${encoder} does not exist or is not executable."
+    return 1
+  fi
 
   eval "${encoder}" "${YUV_RAW_INPUT_WIDTH}" "${YUV_RAW_INPUT_HEIGHT}" \
       "${YUV_RAW_INPUT}" "${output_file}" "${ref_frame_num}" \
       ${devnull}
 
   [ -e "${output_file}" ] || return 1
 }
 
 vp8cx_set_ref_vp8() {
   if [ "$(vp8_encode_available)" = "yes" ]; then
     vpx_set_ref vp8 || return 1
   fi
 }
 
 vp8cx_set_ref_tests="vp8cx_set_ref_vp8"
 
 run_tests vp8cx_set_ref_verify_environment "${vp8cx_set_ref_tests}"