nawk: add nix-update-script

pkgs/by-name/na/nawk/package.nix

@@ -5,6 +5,7 @@
   bison,
   buildPackages,
   installShellFiles,
+  nix-update-script,
 }:
 
 stdenv.mkDerivation (finalAttrs: {
@@ -44,6 +45,8 @@ stdenv.mkDerivation (finalAttrs: {
     runHook postInstall
   '';
 
+  passthru.updateScript = nix-update-script { };
+
   meta = {
     homepage = "https://github.com/onetrueawk/awk";
     description = "One, true implementation of AWK";