Revert "Making nixos keep a ref to its stdenv"

This reverts commit d170c98d13a7b622c57c9b9f727a6bfec95a9181.

niksnut argues that we need smaller system closures, not bigger.

So users facing the trouble of getting gcc rebuilds after nix-collect-garbage
for any minimal nixos configuration change should use other means of
not losing the stdenv output.

One way is to keep one somewhere: nix-build -A stdenv -o stdenv '<nixpkgs>'.
Another may be to use nix.conf options like gc-keep-outputs, gc-keep-derivations
or env-keep-derivations.

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