mark all dtors which are virtual because base class dtor is virtual explicitly virtual themselves

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@41020 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/cocoa/timer.h

@@ -25,7 +25,7 @@ public:
     wxTimer() { Init(); }
     wxTimer(wxEvtHandler *owner, int timerid = -1) : wxTimerBase(owner, timerid)
         { Init(); }
-    ~wxTimer();
+    virtual ~wxTimer();
 
     virtual bool Start(int millisecs = -1, bool oneShot = false);
     virtual void Stop();