avoid deprecated/removed stl usage

libs_required/ACG/Geometry/bsp/BSPImplT.hh

@@ -200,7 +200,7 @@ private: //---------------------------------------------------------------------
   void _intersect_ball(const Node& _node, const Point & _c, Scalar _r, Callback _callback) const;
 
   template<typename T,typename U>
-  struct less_pair_second: public std::binary_function<T,U,bool> {
+  struct less_pair_second {
       bool operator()(const std::pair<T,U> &left, const std::pair<T,U> &right) {
           return (fabs(left.second) < fabs(right.second));
       }