POE::XS::Loop::Poll (again)

In the spirit of POE::XS::Queue::Array, I've released
POE::XS::Loop::Poll, an implementation of POE's event loop written in
C.

I haven't done any speed benchmarks (or found any), but I expect it to
be slightly lower overhead than the built-in POE::Loop::Select.

Of course, without a benchmark it can only be a guess.

Unfortunately, due to an apparent limitation with Darwin's poll(2)
implementation you can't use this loop with ttys under Darwin.[1]

The nopaste bot on irc.perl.org has been using POE::XS::Loop::Poll
since the 0.005 release.

Tony

[1] From poll(2):
  BUGS
     The poll() system call currently does not support devices.
which is kind of vague, but calls result in POLLNVAL set for the tty fds.