Improved debug output on high-order pointers

OpenTK does not currently support generating bindings for pointers of
order 3 or higher. No OpenGL or OpenGL ES API currently uses such
pointers, so we just issue a warning message if such an API is
encountered in the future.

Source/Bind/FuncProcessor.cs

@@ -211,7 +211,7 @@ namespace Bind
             {
                 System.Diagnostics.Trace.WriteLine(String.Format(
                     "[Error] Type '{0}' has a high pointer level. Bindings will be incorrect.",
-                    type.CurrentType));
+                    type));
             }
         }