Use static cabal2nix in callCabal2nix

(cherry picked from commit 627444c)

The use of this function is disallowed in nixpkgs, and purely there for
the convenience of downstream users. This improves closure size without
any loss of functionality.

pkgs/development/haskell-modules/make-package-set.nix

@@ -111,7 +111,7 @@ let
       sha256Arg = if isNull sha256 then "--sha256=" else ''--sha256="${sha256}"'';
     in pkgs.stdenv.mkDerivation {
       name = "cabal2nix-${name}";
-      buildInputs = [ pkgs.haskellPackages.cabal2nix ];
+      nativeBuildInputs = [ pkgs.cabal2nix ];
       preferLocalBuild = true;
       phases = ["installPhase"];
       LANG = "en_US.UTF-8";