checkInputs used to be added to nativeBuildInputs. Now we have
nativeCheckInputs to do that instead. Doing this treewide change allows
to keep hashes identical to before the introduction of
nativeCheckInputs.
To keep this for the future we also strictDeps where possible, including for janePackages, topkg, oasis and ocamlbuild.
This makes some closures significantly smaller and makes cross compilation easier
