Log Message:
Update ruby-fcgi to 0.9.2.1.

* Raise exception for syscall errors.  rb_sys_fail can't be catched in
  ruby, but there is no reason to terminate the process.

* ruby references to FCGX_Stream must keep the FCGX_Request alive.
  finshing the request must invalidate the streams.

* fix memory and fd leaks

* [ruby20] switch from rb_thread_select() to select() to avoid breakage
  in the future.