default.nix: Drop confusing unused attribute
Its documentation, which was really wrong, tells me this was something
that was either lost early on, or never implemented.
@@ -77,11 +77,6 @@ in
# The whole (default) eval
inherit eval;
- # Shortcut to allow building `nixos` from the same channel revision.
- # This is used by `./nixos/default.nix`
- # Any time `nix-build nixos` is used upstream, it can be used here.
- nixos = import <nixpkgs/nixos>;
-
# Evaluating this whole set is counter-productive.
# It'll put a *bunch* of build products from the misc. inherits we added.
