fix Lwt_unix.get_cpu
fix Lwt_unix.get_cpu

Ignore-this: 969b095adc7c6fca3b36250ccf85bb12

darcs-hash:20110212233553-c41ad-8ec5b2c221df43ca7c71932d14b0f099d21eccb3

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