ghcWithPackages: fix ghc version passing

The correct ghc version was not passed through anymore, I'm not entirely
sure this is the correct fix or if this is the only argument that was
missing.

broken by 5e31e828f8

cc @Ericson2314

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

@@ -102,6 +102,7 @@ let
 
   withPackages = packages: buildPackages.callPackage ./with-packages-wrapper.nix {
     inherit (self) llvmPackages;
+    inherit ghc;
     inherit packages;
   };