Warning fixes found under hardest mode of OpenWatcom. Seems clean in Borland, MinGW and DMC.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@29660 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

demos/forty/playerdg.h

@@ -17,7 +17,7 @@ class PlayerSelectionDialog : public wxDialog
 {
 public:
     PlayerSelectionDialog(wxWindow* parent, ScoreFile* file);
-    virtual ~PlayerSelectionDialog();
+    virtual ~PlayerSelectionDialog(){};
 
     const wxString& GetPlayersName();
     void ButtonCallback(wxCommandEvent& event);