ds: remove IO::Poll support (for now)

It may be reinstated at a later time if there's interest; but I
want to be able to use one-shot notifications for certain events
while retaining level-triggered notifications others.

OTOH, I intend to fully support kqueue; via IO::KQueue for now,
but via syscall() eventually to take advantage of the syscall
reduction kevent(2) can provide over (current) epoll APIs.

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