Add some locale-related functions for openbsd

[umanwizard]

These are available since OpenBSD 6.2.

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @Amanieu (or someone else) soon.

If any changes to this PR are deemed necessary, please add them as extra commits. This ensures that the reviewer can see what has changed since they last reviewed the code. Due to the way GitHub handles out-of-date commits, this should also make it reasonably obvious what issues have or haven't been addressed. Large or tricky changes may require several passes of review and changes.

Please see the contribution instructions for more information.

[JohnTitor]

Looks good, thanks!

[JohnTitor]

@bors r+

[bors]

📌 Commit 39be894 has been approved by JohnTitor

[bors]

⌛ Testing commit 39be894 with merge fad1e6f...

[bors]

☀️ Test successful - checks-actions, checks-cirrus-freebsd-11, checks-cirrus-freebsd-12, checks-cirrus-freebsd-13
Approved by: JohnTitor
Pushing fad1e6f to master...

[semarie]

@JohnTitor don't hesitate to ping me for OpenBSD related changes as the CI doesn't cover it.

@umanwizard could you complete the PR with adding the new exported functions to libc-test/semver/openbsd.txt ?

[JohnTitor]

@JohnTitor don't hesitate to ping me for OpenBSD related changes as the CI doesn't cover it.

@umanwizard could you complete the PR with adding the new exported functions to libc-test/semver/openbsd.txt ?

Opened rust-lang/highfive#333 and #2155 to address the above, sorry for the breakage!