Auto merge of #496 - fiveop:consolidate_socketaddr_storage, r=@fiveop
Auto merge of #496 - fiveop:consolidate_socketaddr_storage, r=@fiveop

Always use libc's socketaddr_storage

Since rust-lang/rust#23425 is closed, we no longer need the special
case.

kamalmarhubi/nix-rust,posborne/rust-nix,carllerche/nix-rust,nix-rust/nix,MarkusJais/nix-rust,berkowski/nix,xd009642/nix,kamalmarhubi/nix-rust,carllerche/nix-rust,posborne/rust-nix,xd009642/nix,carllerche/nix-rust,Susurrus/nix,nix-rust/nix,geofft/nix-rust,posborne/rust-nix,berkowski/nix,Susurrus/nix,asomers/nix,geofft/nix-rust,MarkusJais/nix-rust,kamalmarhubi/nix-rust,Susurrus/nix,berkowski/nix,xd009642/nix,asomers/nix,MarkusJais/nix-rust,geofft/nix-rust