Add missing pre/postInstall hooks to intel 2023

pkgs/nanos6/jemalloc.nix

@@ -8,6 +8,6 @@ jemalloc.overrideAttrs (old: {
   hardeningDisable = [ "all" ];
   meta = old.meta // {
     description = old.meta.description + " (for Nanos6)";
-    maintainers = old.meta.maintainers // (with lib.maintainers.bsc; [ rarias ]);
+    maintainers = (old.meta.maintainers or []) // (with lib.maintainers.bsc; [ rarias ]);
   };
 })