Various cleanups: threads, STA_NANO

[Eric S. Raymond]

Matthew Selsky <Matthew.Selsky at twosigma.com>:
> > There is some point in listing known-good platforms (Linux is the
> > biggie), but no point in trying to be exhaustive about it, because
> > anybody with enough chops to build this on a Unix variant we don't
> > know about is necessarily clued in enough to apply this creterion
> > themselves.
> 
> Agreed.  Can we update https://www.ntpsec.org/supported-platforms.html to be less specific to avoid having yet another table that we need to update?  We can list distros, since that won't change much.
> 
> > Maybe we want to replace that with "we support the current (and current - 1) versions of the following platforms/distros as long as they're supported by upstream"?  Or replace this section with a link to docs.ntpsec.org and the CI system?
> 
> If you're OK with some variation of this, I'll submit an MR.

I'm OK with it.
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		<a href="http://www.catb.org/~esr/">Eric S. Raymond</a>

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