remove the fifo hack from Lwt_io.open_file
remove the fifo hack from Lwt_io.open_file

Ignore-this: 401b3be04a07d035b79adc4b96f0ac4a

darcs-hash:20100224132059-c41ad-c05a8566a5923b7705127b206d283e36df2b4f54

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