fix Lwt_unix.abort
fix Lwt_unix.abort

Ignore-this: 284bb634e4b39f5d082149c998b2fd57

darcs-hash:20110630135402-c41ad-f09bf15b8d76d40f10ad769e0c29775f801e2b9a

rgrinberg/lwt,mirage/lwt,c-cube/lwt,ocsigen/lwt,rneswold/lwt,rneswold/lwt,ocsigen/lwt,rneswold/lwt,gfxmonk/lwt,mfp/lwt,rgrinberg/lwt,mfp/lwt,mirage/lwt,c-cube/lwt,ocsigen/lwt,rgrinberg/lwt,fdopen/lwt,janestreet/lwt-async,c-cube/lwt,rgrinberg/lwt,janestreet/lwt-async,fdopen/lwt,gfxmonk/lwt