* Revert r15862, as the "host" package in system-path.nix (or any other   package) can be overriden by setting environment.systemPackages in   /etc/nixos/configuration.nix: it shouldn't be special-cased.
* Revert r15862, as the "host" package in system-path.nix (or any other
  package) can be overriden by setting environment.systemPackages in
  /etc/nixos/configuration.nix: it shouldn't be special-cased.


git-svn-id: a8013ee9bf6b053da8ea218c5059f3906c3a3af2@15863 70bd8c7a-acb8-0310-9f0d-9cc1c95dcdbb

falsifian/personal_nixos,falsifian/personal_nixos,falsifian/personal_nixos,falsifian/personal_nixos,falsifian/personal_nixos