Fix warning under windows

Core/Tools/inc/IObserver.h

@@ -31,7 +31,7 @@ public:
     virtual ~IObserver() {}
 
     //! method which is used by observable subject to notify change in status
-    virtual void update (IObservable */*subject*/) {
+    virtual void update (IObservable* /*subject*/) {
         throw NotImplementedException("IObserver::update() -> Not implemented");
     }