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/ctrlsub.h

@@ -32,6 +32,7 @@ class WXDLLEXPORT wxItemContainer
 {
 public:
     wxItemContainer() { m_clientDataItemsType = wxClientData_None; }
+    virtual ~wxItemContainer();
 
     // adding items
     // ------------
@@ -86,10 +87,6 @@ public:
     int Number() const { return GetCount(); }
 #endif // WXWIN_COMPATIBILITY_2_2
 
-#ifdef __DARWIN__
-    virtual ~wxItemContainer() { }
-#endif
-
 protected:
     virtual int DoAppend(const wxString& item) = 0;