Added clean target for the Makefile in utp_file/
Added clean target for the Makefile in utp_file/

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