arcan: migrate to by-name

pkgs/by-name/ar/arcan/package.nix

@@ -2,6 +2,7 @@
 , stdenv
 , fetchFromGitHub
 , SDL2
+, callPackage
 , cmake
 , espeak
 , ffmpeg
@@ -197,6 +198,10 @@ stdenv.mkDerivation (finalAttrs: {
     "format"
   ];
 
+  passthru = {
+    wrapper = callPackage ./wrapper.nix { };
+  };
+
   meta = {
     homepage = "https://arcan-fe.com/";
     description = "Combined Display Server, Multimedia Framework, Game Engine";