Fix using lld in shell-for

Before we didn't actually include lld in the environment.
Let's add that to the nativeBuildInputs if the compiler is using lld.

Author: TeofilC

builder/shell-for.nix

@@ -124,7 +124,7 @@ in
       ++ nativeBuildInputs
       ++ mkDrvArgs.nativeBuildInputs or []
       ++ lib.attrValues (buildPackages.haskell-nix.tools compiler.nix-name tools)
-      ++ (lib.optional (ghc.useLdLld or false) llvmPackages.bintools)
+      ++ (lib.optional (ghcEnv.baseGhc.useLdLld or false) llvmPackages.bintools)
       # If this shell is a cross compilation shell include
       # wrapper script for running cabal build with appropriate args.
       ++ lib.optional (ghcEnv.targetPrefix != "") (