[Python-3000] setup.py fails in the py3k-struni branch

["Martin v. Löwis"]

>> The os.environ.get() method probably should return a unicode string. (?)
> 
> Indeed -- care to contribute a patch?

Ideally, such a patch would make use of the Win32 Unicode API for
environment variables on Windows. People had already been complaining
that they can't have "funny characters" in the value of an environment
variable, even though the UI allows them to set the variable just fine.

Regards,
Martin