make-derivation.nix: Fix checkMetaRecursively

  meta = checkMeta.commonMeta {

    inherit validity attrs pos;

    references = attrs.nativeBuildInputs ++ attrs.buildInputs

              ++ attrs.propagatedNativeBuildInputs ++ attrs.propagatedBuildInputs;

    references = attrs.nativeBuildInputs or [] ++ attrs.buildInputs or []

              ++ attrs.propagatedNativeBuildInputs or [] ++ attrs.propagatedBuildInputs or [];

  };

  validity = checkMeta.assertValidity { inherit meta attrs; };