[C++-sig] reproducing the bug (???) with -pedantic

[Giulio Eulisse]

> try changing line 37 of make_ptr_instance.hpp from:
>         PyTypeObject* derived = get_derived_class_object(is_polymorphic<U>::type(), p);
> to 
>         PyTypeObject* derived = get_derived_class_object(typename is_polymorphic<U>::type(), p);
> and let me know.

It works! Thanks a lot!

Ciao,
Giulio