NOMERGE: feat(hostname): support AIX targets

[xtqqczze]

The package now compiles successfully for AIX targets:

RUSTC_BOOTSTRAP=1 cargo clippy -q -Zbuild-std \
  -p uu_hostname --all-features --all-targets
  --target powerpc64-ibm-aix

Closes #14915.
Depends on: djc/hostname#61.

[github-actions]

GNU testsuite comparison:

Congrats! The gnu test tests/id/setgid is no longer failing!

[SnoozeThis]

(https://snoozeth.is/M_E0XiJYgD4) I will wait until https://github.com/djc/hostname has tag v0.4.3 and then add a comment.

[codspeed]

Merging this PR will degrade performance by 9.33%

❌ 2 regressed benchmarks
✅ 391 untouched benchmarks
⏩ 54 skipped benchmarks¹

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	Simulation	three_39_bit_primes	533 ms	626.8 ms	-14.96%
❌	Simulation	sort_reverse_utf8_locale	80.6 ms	83.3 ms	-3.32%

Tip

Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.

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_{Comparing xtqqczze:hostname-aix (c0e5edf) with main (2b85f6f)}

Footnotes

1. 54 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[xtqqczze]

make / Build MSYS (windows-latest, feat_os_windows) (pull_request) failure tracked by #14908.

[xtqqczze]

CICD / Build (ubuntu-latest, i686-unknown-linux-musl, feat_os_unix_musl, use-cross) (pull_request) failure tracked by #15004.