[extrowerk]

AI_CANONNAME was the only ai_flags value bound, so AI_PASSIVE,
AI_NUMERICHOST and friends had to be hard-coded by users on illumos and
Solaris. Add the rest of the addrinfo flags, the two missing EAI_*
error codes and MAXHOSTNAMELEN, all from <netdb.h>.

These values are inherited unchanged from OpenSolaris and are part of the
binary ABI on both illumos and Solaris.

Source: https://github.com/illumos/illumos-gate/blob/b56614870515295c253babb2b10fffdd3c60fdbe/usr/src/head/netdb.h#L131-L163
Source: https://github.com/illumos/illumos-gate/blob/b56614870515295c253babb2b10fffdd3c60fdbe/usr/src/head/netdb.h#L394
Manual: https://illumos.org/man/3SOCKET/getaddrinfo

Testing

• cargo check for x86_64-unknown-illumos, aarch64-unknown-illumos,
  x86_64-pc-solaris and sparcv9-sun-solaris (with -Dwarnings).
• Every name in the applicable libc-test/semver lists compiles for
  illumos and Solaris; new constant values were cross-checked
  mechanically against the illumos-gate headers.
• ci/style.py checks (rustfmt, sorted/unique semver lists, style test).
• CC=clang cargo test -p libc-test on OmniOS r151060 (x86_64): passes

@rustbot label stable-nominated

🤖 Generated with Claude Code

https://claude.ai/code/session_01PUjq5rfL3s7TbKS3PeAE5K

[rustbot]

Some changes occurred in a solarish module

cc @jclulow, @pfmooney

[tgross35]

Rewrite commit messages and PR descriptions by hand, then you may unmark as a draft. See https://forge.rust-lang.org/policies/llm-usage.html#-banned.