Auto merge of #381 - fiveop:fix_musl, r=utkarshkukreti
Auto merge of #381 - fiveop:fix_musl, r=utkarshkukreti

musl target needs std::mem now

Closes nix-rust/nix#325.

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