Do not make IOBase generic (python#11)

Author: emmatyping

Modules/_io/iobase.c

@@ -824,8 +824,6 @@ static PyMethodDef iobase_methods[] = {
     _IO__IOBASE_READLINES_METHODDEF
     _IO__IOBASE_WRITELINES_METHODDEF
 
-    {"__class_getitem__", (PyCFunction)Py_GenericAlias, METH_O|METH_CLASS,
-     PyDoc_STR("See PEP 585")},
     {NULL, NULL}
 };