nix develop should ignore output checks in general. This was done only for the old way of specifying output checks, the structured attrs way requires rewriting the JSON and removing the output checks pieces. We take a brutal approach of removing as many as possible including non-recommended ways of doing it. Fixes #997. Change-Id: Iaf83029016c71b5171e56e15d4eadc1a60a8be98 Signed-off-by: Raito Bezarius <raito@lix.systems>