Update setup.py to work on Windows #3

[Toolman]

I have this problem. This is the solution. I've copied the file (setup.py) to the clipboard but don't know what to do with it. There are dozens of instances of setup.py across my system. Where does this particular one go?

OS: Windows 10
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.18.4 (GitTag)
Build type: Release
Branch: releases/FreeCAD-0-18
Hash: 980bf9060e28555fecd9e3462f68ca74007b70f8
Python version: 3.6.6
Qt version: 5.6.2
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: English/UnitedStates (en_US)
pip 20.1