message: Fix portability for size check
diff: @@ -78,8 +78,8 @@ while read -r rev; do
  echo "Commit ${rev} contains a binary file: ${fname} (${binary})" 1>&2
  fi
  - size="$(stat -f%z ${fname})"
  - if [ ${size} -gt 300000 ]
  + size="$(du -k ${fname} | cut -f1)"
  + if [ ${size} -gt 400 ] # currently no file larger than 400K in mfem
  then
  echo "Commit ${rev} adds/modifies a very large file: ${fname}" 1>&2
  fi
  