Remove casts to Oriented_side.

They are useless since we merged the various enum types.

Homogeneous_kernel/include/CGAL/Homogeneous/function_objects.h

@@ -4377,7 +4377,7 @@ namespace HomogeneousKernelFunctors {
 	ot = orientation(t.vertex(0), t.vertex(1), t.vertex(2));
 
       if (o1 == ot && o2 == ot && o3 == ot) // ot cannot be COLLINEAR
-	return Oriented_side(ot);
+	return ot;
       return
 	(o1 == COLLINEAR
 	 && collinear_are_ordered_along_line(t.vertex(0), p, t.vertex(1))) ||
@@ -4386,7 +4386,7 @@ namespace HomogeneousKernelFunctors {
 	(o3 == COLLINEAR
 	 && collinear_are_ordered_along_line(t.vertex(2), p, t.vertex(3)))
 	? ON_ORIENTED_BOUNDARY
-	: Oriented_side(-ot);
+	: -ot;
     }
   };