nuttx: Add _SC_HOST_NAME_MAX constant

[no1wudi]

Description

Add the missing _SC_HOST_NAME_MAX sysconf constant for the NuttX platform. This constant is used with sysconf() to get the maximum length of a host name.

Sources

• NuttX unistd.h: https://github.com/apache/nuttx/blob/master/include/unistd.h#L170

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

[no1wudi]

@rustbot label +stable-nominated

[JohnTitor]

Could you rebase instead of merging?

[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.

[JohnTitor]

Thanks!

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