fix(mkTf2Config): Pass additional arguments to mkDerivation

tf2/packages/huds/hud-db/default.nix

@@ -1,13 +1,23 @@
-{ mkTf2Config, fetchFromGitHub }:
+{ mkTf2Config, fetchFromGitHub, lib }:
 
 builtins.mapAttrs
   (name: e: mkTf2Config {
     pname = name;
-    env.description = e.description;
     custom = [
       (fetchFromGitHub (builtins.removeAttrs e.src ["__type"] // {
         name = "${name}-src";
       }))
     ];
+    meta = {
+      inherit (e) description;
+      # Hud-db currently requires all HUDs to be on GitHub.  We can thus
+      # somewhat-safely assume the homepage.  A number of packages have
+      # explicitly-set homepages, and we do not yet support them.  Doing so
+      # requires patching the fetch-hud-db script, which I intend to do soonish.
+      homepage = "https://github.com/${e.src.owner}/${e.src.repo}";
+      platforms = lib.platforms.all;
+      # The biggest outstanding issue is recording the license here.  Hud-db
+      # does not track license info, whiuch is a big issue IMO.
+    };
   })
   (builtins.fromJSON (builtins.readFile ./hud-db.json))