Define fuer Versionscounter

Change-Id: I1e4be3d942a87454f2ab435a2a6f309880fee710
diff --git a/std/player/protocols/mudlet_gui.c b/std/player/protocols/mudlet_gui.c
index 12feb45..3a248ee 100644
--- a/std/player/protocols/mudlet_gui.c
+++ b/std/player/protocols/mudlet_gui.c
@@ -1,9 +1,12 @@
 #pragma strong_types,rtt_checks,no_clone,no_inherit,no_shadow
 
+CURRENT_VERSION 2
+
 // Liefert die URL zum Download und die aktuelle Version des
 // MorgenGrauen.mpackage fuer Mudlet.
 public <int|string>* current_version()
 {
-  return ({"https://mg.mud.de/download/MorgenGrauen.mpackage", 2});
+  return ({"https://mg.mud.de/download/MorgenGrauen.mpackage",
+           CURRENT_VERSION});
 }