Added a virtual destructor to please the compilers.

git-svn-id: http://yate.null.ro/svn/yate/trunk@694 acf43c95-373e-0410-b603-e72c3f656dc1

engine/Message.cpp

@@ -414,4 +414,9 @@ void MessageDispatcher::setHook(MessagePostHook* hook, bool remove)
     m_mutex.unlock();
 }
 
+
+MessageNotifier::~MessageNotifier()
+{
+}
+
 /* vi: set ts=8 sw=4 sts=4 noet: */

yatengine.h

@@ -474,6 +474,11 @@ private:
 class YATE_API MessageNotifier
 {
 public:
+    /**
+     * Destructor. Keeps compiler form complaining.
+     */
+    virtual ~MessageNotifier();
+
     /**
      * This method is called after a message was dispatched.
      * @param msg The already dispatched message message