Make arm64 test script comaptable with old versions of gsutil.

platform_tools/barelinux/bin/arm64_download

 #!/bin/sh
 
 # Copyright 2014 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 
 usage() {
     cat >&2 <<EOF
@@ skipping 27 matching lines @@
     if [ $ret != 0 ] ; then
         echo "'$@' failed and returned ${ret}." >&2
         return $ret
     fi
 }
 
 gsutil_check_get() {
     local gurl="$1"
     local file="$2"
     if ! [ -f "$file" ] || \
-        [ "$(gsutil stat "$gurl" | sed -n 's/\W*Hash (md5):\W*//p')" \
+        [ "$(gsutil ls -L "$gurl" | sed -n 's/\W*Hash (md5):\W*//p')" \
         != "$(md5sum < "$file" | sed 's/\W*-//')" ] ; then
         try gsutil cp "$gurl" "$file" || return
     fi
 }
 
 download_compiler() {
     local working_dir="$1"
     local location="$2"
     local toolchain="$3"
 
@@ skipping 99 matching lines @@
 }
 
 for command in gsutil xz tar gunzip; do
     try command -v "$command" > /dev/null || usage || exit
 done
 
 if [ -z "$1" ] ; then
     usage || exit
 fi
 try arm64_download "$1" || exit