Add missing special signature for "__getattribute__" method in order to...

Add missing special signature for "__getattribute__" method in order to enforce it and mark the method as special.

Cython/Compiler/TypeSlots.py

@@ -891,6 +891,7 @@ MethodSlot(objargproc, "", "__delitem__")
 MethodSlot(ssizessizeobjargproc, "", "__setslice__")
 MethodSlot(ssizessizeargproc, "", "__delslice__")
 MethodSlot(getattrofunc, "", "__getattr__")
+MethodSlot(getattrofunc, "", "__getattribute__")
 MethodSlot(setattrofunc, "", "__setattr__")
 MethodSlot(delattrofunc, "", "__delattr__")
 MethodSlot(descrgetfunc, "", "__get__")