fix tar command

flake.nix

···
           inherit system overlays;
         };
         rustVersion = pkgs.rust-bin.stable.latest.default;
-        craneLib = ((crane.mkLib pkgs).overrideToolchain rustVersion).overrideScope (import ./overlays/cfg-if-fix.nix);
+        craneLib = (crane.lib.${system}.overrideToolchain rustVersion).overrideScope (import ./overlays/cfg-if-fix.nix);
 
         nurPackages = import ./default.nix {
           inherit pkgs craneLib;
···
         };
       }
     );
-}
+}

overlays/cfg-if-fix.nix

···
         '';
       } else { }
     ));
-}
+}