Phantom import when importing from ctypes

[rianhunter]

Getting a missing CPyModule__ctypes when trying to compile the following file:

import ctypes

class c_timespec(ctypes.Structure):
    pass

mypyc seems to be incorrectly parsing the ctypes stub file and now automatically pulling in the _ctypes dependency.

[rianhunter]

Note: I am happy to put all the effort into fixing this issue if someone can clarify what the bug is.