Use type flag instead of custom constructor in _struct.unpack_iterator

Currently _struct.unpack_iterator type defines its own constructor just to report to user that it isn't instantiable (with a typo, by the way):

cpython/Modules/_struct.c 61F1

Lines 1835 to 1838 in 8d95012

    
           PyObject *unpackiter_new(PyTypeObject *type, PyObject *args, PyObject *kwds) { 
        
               PyErr_Format(PyExc_TypeError, "Cannot create '%.200s objects", _PyType_Name(type)); 
        
               return NULL; 
        
           }

It can be easily removed and replaced by appropriate type flag. I'll submit a PR.

Linked PRs

gh-104276: Make _struct.unpack_iterator type use type flag instead of custom constructor #104277

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	PyObject unpackiter_new(PyTypeObject type, PyObject args, PyObject kwds) {
	PyErr_Format(PyExc_TypeError, "Cannot create '%.200s objects", _PyType_Name(type));
	return NULL;
	}

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