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/listbox.h

@@ -45,9 +45,7 @@ class WXDLLEXPORT wxListBoxBase : public wxControlWithItems
 public:
     // all generic methods are in wxControlWithItems, except for the following
     // ones which are not yet implemented by wxChoice/wxCombobox
-#ifdef __DARWIN__
-    virtual ~wxListBoxBase() { }
-#endif
+    virtual ~wxListBoxBase();
 
     void Insert(const wxString& item, int pos)
         { DoInsert(item, pos); }