Fix redox

[mati865]

Revival of #1422

All the missing impls were added in #1438

Should unblock rust-lang/rust#61393

[mati865]

Successful build: https://travis-ci.com/mati865/libc/builds/121390368

[newpavlov]

You will need to add Clone impls and define timezone) and probably remove derive of traits (or implement them manually) which cause failures here.

[gnzlbg]

The derive of traits (except for Copy and Clone) aren't really necessary for anything, so you can just leave them all out.

[mati865]

It was fixed in #1438

The build fails because of rust-lang/rust#63115 which will be fixed by rust-lang/rust#63122

[newpavlov]

@gnzlbg
Can you re-run CI to see if the issue got fixed?

[mati865]

CI is being migrated to Azure and will not succeed without #1376

[jackpot51]

This is no longer required

[mati865]

It won't be necessary for new nightly builds but libc is still empty when building for Redox from old nightly, beta or stable although I don't even know if they work after all those changes.

[jackpot51]

I don't really see a use case for building for Redox prior to the 2019-08-08 nightly

[jackpot51]

Anything doing that will need to be updated anyways

[bors]

☔ The latest upstream changes (presumably #1408) made this pull request unmergeable. Please resolve the merge conflicts.