[issue19465] selectors: provide a helper to choose a selector using constraints

[Charles-François Natali]

Charles-François Natali added the comment:

> Antoine Pitrou added the comment:
>
> I think this is more of a documentation issue. People who don't want a new fd can hardcode PollSelector (poll has been POSIX for a long time).

That's also what I now think.
I don't think that the use case is common enough to warrant a
"factory", a default selector is fine.

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