Removed duplicate function Lwt_unix.setsockopt.
Removed duplicate function Lwt_unix.setsockopt.

rneswold/lwt,mfp/lwt,rneswold/lwt,ocsigen/lwt,fdopen/lwt,rgrinberg/lwt,rgrinberg/lwt,fdopen/lwt,c-cube/lwt,c-cube/lwt,mfp/lwt,c-cube/lwt,rgrinberg/lwt,ocsigen/lwt,rneswold/lwt,rgrinberg/lwt,ocsigen/lwt