Remove use of std::binary_function

src/main/Scene.cc

@@ -7,7 +7,6 @@
 #include <utility>              /* pair */
 #include <map>
 #include <algorithm>            /* sort() */
-#include <functional>           /* binary_function */
 #include <typeinfo>             /* typeid operator support */
 
 #include "Scene.h"

src/shapes/Shape.cc

@@ -1,7 +1,6 @@
 
 #include "Shape.h"
 #include <algorithm>                /* sort() */
-#include <functional>               /* binary_function */
 #include <utility>
 using namespace std;
 
@@ -28,9 +27,6 @@ void Shape::setMaterial(refptr<Material> material)
 }
 
 class BoolIntersectionComparator
-    : public std::binary_function<Shape::BoolIntersection,
-                                  Shape::BoolIntersection,
-                                  bool>
 {
     public:
         BoolIntersectionComparator(const Vector & refPoint)