Fix const for field tm_zone in struct tm

[semarie]

Description

The PR makes the CI to ignore tm_zone field in struct tm. The const has been recently added in OpenBSD (see sources).

The another way is to properly define struct tm in OpenBSD, and move the currently global definition to each unix platform. It might be preferable. Feel free to ask for this way 😃

Sources

• openbsd/src@4a796cf
• https://github.com/openbsd/src/blob/7a3d6f69f0a9b1766a54f549b550113ea4d460f1/include/time.h#L98

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

[JohnTitor]

The another way is to properly define struct tm in OpenBSD, and move the currently global definition to each unix platform. It might be preferable. Feel free to ask for this way 😃

If it doesn't confuse downstream users, I'd prefer! I'm not sure but OpenBSD 7.8 doesn't have it yet?

[semarie]

the change (on OpenBSD side) is for upcoming OpenBSD-7.9

[JohnTitor]

Cool, thank you!

[rustbot]

This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.