linux SCTP support part 2 (revival)

[gnaaman-dn]

Description

Revival of #3117
Adds SCTP structs and constants.

Changes from original PR:

• Rebased
• Added missing SCTP_ADDR_POTENTIALLY_FAILED enum variant

Sources

https://github.com/torvalds/linux/blob/master/include/uapi/linux/sctp.h

https://man7.org/linux/man-pages/man7/sctp.7.html

Checklist

• Relevant tests in libc-test/semver have been updated
• No placeholder or unstable values like *LAST or *MAX are
  included (see #3131)
• Tested locally (cd libc-test && cargo test --target mytarget);
  especially relevant for platforms that may not be checked in CI

[rustbot]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @tgross35 (or someone else) some time within the next two weeks.

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[gnaaman-dn]

Apologies for multiple pushes, I wasn't aware that --autosquash doesn't do anything without -i

[gnaaman-dn]

Powepc seems to die to SIGILL, but it passes locally when running the same suite:

Caused by:
  process didn't exit successfully: `qemu-ppc -L /usr/powerpc-linux-gnu /checkout/target/powerpc-unknown-linux-gnu/debug/deps/main-00ed33f9c2abd801` (signal: 4, SIGILL: illegal instruction)

Locally:

---

Anyone encountered this?

[gnaaman-dn]

Sorry, no idea how to debug this PPC issue.