implement out-of-line destructors where needed instead of using __DARWIN__

specific conditional compilation


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@13447 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/app.h

@@ -88,6 +88,7 @@ class WXDLLEXPORT wxAppBase : public wxEvtHandler
 {
 public:
     wxAppBase();
+    virtual ~wxAppBase();
 
     // the virtual functions which may/must be overridden in the derived class
     // -----------------------------------------------------------------------
@@ -326,11 +327,6 @@ public:
     static wxAppInitializerFunction GetInitializerFunction()
         { return m_appInitFn; }
 
-    // needed to avoid link errors
-#ifdef __DARWIN__
-    virtual ~wxAppBase() { }
-#endif
-
     // process all events in the wxPendingEvents list
     virtual void ProcessPendingEvents();