some fixes from the SGI build log

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@5633 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/dataform.h

@@ -24,6 +24,8 @@ public:
     wxDataFormat( const wxChar *id );
     wxDataFormat( NativeFormat format );
 
+    wxDataFormat& operator=(const wxDataFormat& format)
+        { m_type = format.m_type; m_format = format.m_format; return *this; }
     wxDataFormat& operator=(NativeFormat format)
         { SetId(format); return *this; }