
`MacOS::Xcode.without_clt? && MacOS.sdk_path.nil?` should never be true. In its earliest form, this would raise a bare RuntimeError in an effort to have the bug reported. Later, it was changed to silently disable superenv. But we don't want to do that. If there's a bug, or the user's system is misconfigured, we want to know, so that we can fix the bug, or the user can fix their system. So let's remove the condition.