use DECLARE_NO_COPY_CLASS() where applicable (patch 633384)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@18525 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/ole/dropsrc.h

@@ -76,6 +76,8 @@ protected:
 
 private:
     wxIDropSource *m_pIDropSource;  // the pointer to COM interface
+
+    DECLARE_NO_COPY_CLASS(wxDropSource)
 };
 
 #endif  //_WX_OLEDROPSRC_H