Through the discussion on this issue it came up that we might want to remove the objc_library transition. I also think this might be a blocker to some changes like this where we would like to change the transition in rules_apple to support this case, but a similar transition is duplicated here and likely needs to be kept roughly in sync.

We heard at bazelcon that some folks at google might be looking into removing this, so I wanted to file this tracking issue for discussion