message: use latest msgpack
diff: @@ -56,7 +56,7 @@ fi
  # Need version >= 2.1.2, because for 2.1.2 and earlier, it has a bug in the
  # decoding of msgpack buffers
  -ver=2.1.2
  +ver=2.1.3
  echo '***' fetching msgpack $ver '***'
  echo
  zipfile=cpp-${ver}.tar.gz
  