add wintypes to the ctypes import

[rdamiani]

Using the internal simulator in the toolbox on win64, it bombs on line 256 of control_interface.py

dlclose = lambda handle: 0 if _dlclose(handle) else 1

fixed following this: https://bugs.python.org/issue30286

ctypes.windll.kernel32.FreeLibrary.argtypes = [wintypes.HMODULE] #RRD added
and importing wintypes in the ctypes import.

check my fork if useful, and can close this.
Thx.

[dzalkind]

Thanks for the update, @rdamiani. Can you provide a link to your suggested fix?

[rdamiani]

rdamiani@e59b7ac
hopefully this works