nixos/testing/driver: Copy cross fix from modules/misc/nixpkgs.nix

f7077ba131

Fixes `error: makeWrapper/makeShellWrapper must be in nativeBuildInputs`

`pkgsCross.aarch64-multiplatform.nixosTests.sway`

nixos/lib/testing/driver.nix

@@ -175,7 +175,12 @@ in
   };
 
   config = {
-    _module.args.hostPkgs = config.hostPkgs;
+    _module.args = {
+      hostPkgs =
+        # Comment is in nixos/modules/misc/nixpkgs.nix
+        lib.mkOverride lib.modules.defaultOverridePriority
+          config.hostPkgs.__splicedPackages;
+    };
 
     driver = withChecks driver;