[Lwt.choose] do not leak memory anymore
[Lwt.choose] do not leak memory anymore

Ignore-this: 378fb9867686255e84384320a0b0d950

When a choose terminates, it removes all unneeded waiters.

darcs-hash:20090413144222-c41ad-56054431bf55a565f89f16b8a562eda6214aeb7c

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