compilation fix

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_4_BRANCH@21017 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/mgl/window.cpp

@@ -564,7 +564,7 @@ void wxWindowMGL::Init()
 wxWindowMGL::~wxWindowMGL()
 {
     // Send destroy event
-    wxWindowDestroyEvent destroyEvent(this);
+    wxWindowDestroyEvent destroyEvent((wxWindow*)this);
     destroyEvent.SetId(GetId());
     GetEventHandler()->ProcessEvent(destroyEvent);