This fixes all packages that are failed `nixpkgs-review` in #91790.
Packages that were broken prior to that PR were marked as broken.
Packages that failed because of #75729 were fixed.
This is a minimal change mainly to make sure repology recognizes this
package as sage. I plan a bit more refactoring later, but this is
intentionally kept minimally invasive so that it won't break anything
and can be backported to 18.09.