Auto merge of #274 - abbradar:new-syscalls, r=kamalmarhubi
Auto merge of #274 - abbradar:new-syscalls, r=kamalmarhubi

New syscalls

Part of #270

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