Add missing staff for Illumos/Solaris as used in quinn

[psumbera]

[rustbot]

r? @JohnTitor

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[rustbot]

Some changes occurred in solarish module

cc @jclulow, @pfmooney

[pfmooney]

libc-test still passes on illumos with this change in place

[psumbera]

@JohnTitor can you please have look at this? Thank you!

[psumbera]

@JohnTitor is there anything wrong with this pull request?

[psumbera]

r? @tgross35

Can you please help with merging of this?

[tgross35]

I am not sure what to check against, are there docs/headers online for the constants? Changes themselves look fine to me with one nit above.

Please rebase and squash so the merge commits go away.

(Also, I assume the PR title and commit is meant to say "add missing stuff". Please make this more descriptive, e.g. "Add missing networking support for solaris".)

[psumbera]

I am not sure what to check against, are there docs/headers online for the constants?

The only way how to review header files I can think of is:

1. Login to Solaris 11.4 machines as they are available at https://portal.cfarm.net/machines/list/
2. Install Solaris CBE release per https://blogs.oracle.com/solaris/post/announcing-the-first-oracle-solaris-114-cbe

[tgross35]

I don't have a cfarm account so that would take a couple days. Since @pfmooney has already verified illumos, I have no objection to merging.

This should have an update libc-test/semver, otherwise LGTM.

[tgross35]

@rustbot author