Remove usage of select syscall on Linux

[Russell Greene]

We are auditing all our code and dependencies for usage of `select` as it
is not safe to use on applications with more than 1024 open fds, and ours
certainly meets that. (see man 2 select)

We've prepared a patch that keeps functionality as close as possible on
Linux, which requires using ppoll to keep the sub-millisecond timeout
accuracy.

If this is not an important feature to keep, I'm happy to prepare a simpler
patch that just uses poll.


Thank you!
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