Add wrappers for 2ship2harkinian and sm64ex also.

Set the steam launcher to run /home/deck/.nix-profile/bin/steam_<GAME> to have it work inside steam gaming mode.

nix/steam_deck/configuration/roles/sm64ex/default.nix

@@ -5,6 +5,12 @@
   ...
 }:
 
+let
+  steam_sm64ex = pkgs.writeScriptBin "steam_sm64ex" ''
+    export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:${pkgs.libglvnd}/lib"
+    exec ${pkgs.sm64ex}/bin/sm64ex
+  '';
+in
 {
   imports = [ ];
 
@@ -24,6 +30,7 @@
 
         home.packages = with pkgs; [
           sm64ex
+          steam_sm64ex
         ];
 
         # nixpkgs.overlays = [