fix uTP endian issue
fix uTP endian issue

robgjansen/libutp,robgjansen/libutp,bittorrent/libutp,anacrolix/go-libutp,wujf/libutp,robgjansen/libutp,anacrolix/go-libutp,anacrolix/go-libutp,anacrolix/go-libutp,bittorrent/libutp,bittorrent/libutp,wujf/libutp,wujf/libutp