OWNERS: add more standard environment–related libraries

I think it makes sense for the `stdenv` team to handle review of
changes to these libraries that have substantial effects on the
things in their scope, like the semantics of `stdenv.mkDerivation`,
override interfaces, `meta` handling, and so on. This is already how
`lib/systems/` is handled, and it makes sense to me to extend it.

This would hopefully have helped avoid situations
like <https://github.com/NixOS/nixpkgs/pull/403678> and
<https://github.com/NixOS/nixpkgs/pull/410179>, where the `stdenv`
team was unaware of the original change for weeks.

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