unix: Implement Eq, Hash, PartialEq for sockaddr_* types

[kamalmarhubi]

No description provided.

[kamalmarhubi]

Confused by the nightly x86_64 only failure: https://travis-ci.org/rust-lang-nursery/libc/jobs/105324244#L233

[alexcrichton]

Thanks for the PR! Currently, however, the libc crate is intended to be as thin a wrapper as possible around the system libc, for example it only provides the guarantee that structs are Copy (which also forces a Clone impl).

At this time we're not looking for higher level abstractions in libc (e.g. any other form of "Rust code" like Eq or Hash). That's in general left to higher level libraries.

[kamalmarhubi]

Thanks for the explanation!