Changes from Jonathan Riehl to allow his pgen extension (PEP 269) to work. This includes some more code that used to be part of pgen in the main parser; I'm okay with that. I'll see if the Windows build needs work next.

#ifndef Py_ENUMOBJECT_H
#define Py_ENUMOBJECT_H

/* Enumerate Object */

#ifdef __cplusplus
extern "C" {
#endif

PyAPI_DATA(PyTypeObject) PyEnum_Type;

#ifdef __cplusplus
}
#endif

#endif /* !Py_ENUMOBJECT_H */