Add SCTP support

[howjmay]

Thanks for considering submitting a PR!

Here's a checklist for things that will be checked during review or continuous integration.

• Edit corresponding file(s) under libc-test/semver when you add/remove item(s)
• rustc ci/style.rs && ./style src
• cd libc-test && cargo test (This might fail on your env due to environment difference between your env and CI. Ignore failures if you are not sure.)
• Your PR that bumps up the crate version doesn't contain any other changes

Delete this line and everything above before opening your PR.

[rustbot]

r? @JohnTitor

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[howjmay]

@JohnTitor this is just a draft for solving #2962. May you give it a look. If the current way is ok. I will extend to other OS

[JohnTitor]

Thanks for the PR!
The checklist above describes what we expect.
To simplify our review, I'd suggest you add only what you need. CI also should be fixed. Once it's done, I think we can r+ this PR.

[bors]

☔ The latest upstream changes (presumably #3095) made this pull request unmergeable. Please resolve the merge conflicts.

[JohnTitor]

Triage: Closing as inactive, feel free to reopen/recreate if you're still interested in this change. Thanks for the PR anyway!