winetricks: skip null dependencies
winetricks: skip null dependencies

This can be used to reduce closure size when a wrapper uses a custom
WINE at runtime, or a different wine in PATH.

See pkgs/tools/package-management/protontricks/default.nix

NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs