Use typedef typename in PM_point_locator.h

Author: GilesBathgate

Nef_2/include/CGAL/Nef_2/PM_point_locator.h

@@ -104,7 +104,7 @@ class PM_naive_point_locator : public PM_decorator_ {
   |Halfedge_const_handle|, |Halfedge_const_iterator|, |Face_const_handle|,
   |Face_const_iterator|.}*/
 
-  typedef CGAL::Object_handle Object_handle;
+  typedef typename CGAL::Object_handle Object_handle;
   /*{\Mtypemember a generic handle to an object of the underlying plane
   map. The kind of the object |(vertex, halfedge,face)| can be determined and
   the object assigned by the three functions:\\