fizz: add update script

(cherry picked from commit 0414a001b6)
(cherry picked from commit d81dc9e7c4e0216b6f8f01517517d86417b4a7ff)

pkgs/by-name/fi/fizz/package.nix

@@ -22,6 +22,8 @@
   zlib,
 
   gtest,
+
+  nix-update-script,
 }:
 
 stdenv.mkDerivation (finalAttrs: {
@@ -114,6 +116,8 @@ stdenv.mkDerivation (finalAttrs: {
     )
   '';
 
+  passthru.updateScript = nix-update-script { };
+
   meta = {
     description = "C++14 implementation of the TLS-1.3 standard";
     homepage = "https://github.com/facebookincubator/fizz";