API for using poll/epoll instead of select

[Keith Packard]

I'm finishing up replacing select with either poll or epoll (or other)
and wanted to present the API I've constructed for this work.

The goal is to hide the implementation details away from the server so
that we can easily swap in OS-specific replacements. I've implemented
poll and epoll back ends, and also discovered that winsock2 has a
trivial replacment for poll called WSAPoll, so that should be covered as
well.

It's similar to the NotifyFd interfaces added to the OS layer, but has
the ability to support both level-triggered and edge-triggered
notifications. Using edge-triggered notifications along with epoll
reduces the notifications received from the kernel when the server is
busy as only newly ready clients appear.

The NotifyFd interfaces are now fairly simple wrappers around this new
interface.

All of this is on the 'epoll' branch of my X server repository.

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-- 
-keith
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