hackage4nix.hs: don't re-generate broken packages
hackage4nix.hs: don't re-generate broken packages

psibi/cabal2nix,bennofs/cabal2nix,Fuuzetsu/cabal2nix,jb55/cabal2nix,gridaphobe/cabal2nix,spencerjanssen/cabal2nix,dmalikov/cabal2nix