Patch from Hartwig and me for implementing reorderable dataview columns. Works on OS X and GTK+, breaks OS X a litte

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@50919 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/datavgen.cpp

@@ -1199,6 +1199,11 @@ void wxDataViewColumn::SetSortable( bool sortable )
         GetOwner()->OnColumnChange();
 }
 
+void wxDataViewColumn::SetReorderable( bool reorderable )
+{
+    // TODO
+}
+
 void wxDataViewColumn::SetSortOrder( bool ascending )
 {
     m_ascending = ascending;