Patch version from Hans Meine from the duistutils mail list.

https://mail.python.org/pipermail/distutils-sig/2008-April/009336.html
http://mail.python.org/pipermail/distutils-sig/attachments/20080414/16fb135e/attachment-0001.diff
I cannot imagine how it would not because of the new line 1200 in virtualenv.py.

writefile(join(site_dir, 'orig-prefix.txt'), '%s\n%s' % (prefix, exec_prefix))