2017-01-03 Build pypiwin32 on Windows

The module pypiwin32 does not seem to be refreshed on PyPi. To compile it, you need to get the sources from pypiwin32, to install Windows SDK if you did not already (not sure that is required but just in case).

Set up the environment variable MSSdk to the location of the Microsoft SDK. In my case, it was:

set MSSdk=C:\Program Files (x86)\Microsoft SDKs\Windows\v7.1A

Change from distutils.core import setup into from setuptools import setup to be able to build a wheel.