Auto merge of #492 - domsj:fix-eventfd-feature, r=fiveop
Auto merge of #492 - domsj:fix-eventfd-feature, r=fiveop

fix build for eventfd feature

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