fix(ctypes): `super` broken on ctypes on Python3.6
fix(ctypes): `super` broken on ctypes on Python3.6

A previous change tried to have an auto-adapting c-type for bools but
that failed with Python 3.6.  There is some [speculation that it is related
to the class customization feature](https://bugs.python.org/issue29270).

epage/nixnet-python,ni/nixnet-python