Add clock_nanosleep to freebsd and netbsd

[maxbla]

fixes #1921

[rust-highfive]

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[maxbla]

clock_nanosleep was added in freeBSD 11.1 release! time to add another cfg.

[JohnTitor]

Overall it looks good to me but I'm not sure this(clock_nanosleep) is available on redox, is it @jackpot51?

[maxbla]

Thanks for the review. After submitting this PR, I have a couple more concerns

1. Freebsd 11.0 doesn't have clock_nanosleep - it was added in 11.1. If we're still trying to support 11.0, I would need to remove clock_nanosleep from our freebsd 11 target.
2. Contributing.md makes it look like I should add clock_nanosleep to every supported platform's mod.rs instead of unix's mod.rs with a cfg.

regarding redox OS, I searched for clock_nanosleep in redox and relibc and only got results from llvm, so I think its safe to say redox doesn't implement it.

[semarie]

Please note that OpenBSD doesn't support `clock_nanosleep'. For others BSD, I dunno.

[JohnTitor]

So, I'm happy to extend the support for clock_nanosleep but we should add them to the only platforms that we're sure it's available. Given the above comments, I don't think src/unix/mod.rs is the best place atm?

[maxbla]

Yep, totally agree. I'll force push the change I should have made.

[maxbla]

Should I add clock_nanosleep for freebsd 11? clock_nanosleep appears to have been added in 11.1, so it wouldn't work for 11.0

[maxbla]

Turns out clock_nanosleep was only missing on freebsd and netbsd...

[JohnTitor]

The change itself looks good to me, r=me once the above nit is resolved.

[JohnTitor]

Thanks!
@bors r+

[bors]

📌 Commit a6c451d has been approved by JohnTitor

[bors]

⌛ Testing commit a6c451d with merge 22633e2...

[bors]

☀️ Test successful - checks-actions, checks-cirrus-freebsd-10, checks-cirrus-freebsd-11, checks-cirrus-freebsd-12
Approved by: JohnTitor
Pushing 22633e2 to master...