Added AF_UNSPEC and several consts from netdb.h

[glaxx]

No description provided.

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @alexcrichton (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 Due to the way GitHub handles out-of-date commits, this should also make it reasonably obvious what issues have or haven't been addressed.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.

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[alexcrichton]

Looks like the android failures may be legitimate?

[glaxx]

@alexcrichton It should be fixed now.

[alexcrichton]

@bors: r+

Thanks!

[bors]

📌 Commit d37d42a has been approved by alexcrichton

[bors]

⌛ Testing commit d37d42a with merge b21b709...

[bors]

☀️ Test successful - status-appveyor, status-travis
Approved by: alexcrichton
Pushing b21b709 to master...