Patch from Rene Liebscher:

Look for personal config file in /home/greg on Windows, too: users will have
to set /home/greg to use this, so it's not something that many people will
use.  But if python-dev comes up with the "right way" to divine a
home directory on Windows, we can use that to set /home/greg and poof! --
personal Distutils config files on Windows.