added missing virtual dtors to base classes (patch 1150945)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@32347 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/caret.h

@@ -61,6 +61,9 @@ public:
         (void)Create(window, size);
     }
 
+    // a virtual dtor has been provided since this class has virtual members
+    virtual ~wxCaretBase() { }
+
     // Create() functions - same as ctor but returns the success code
     // --------------------------------------------------------------