virtualenv 1.8.4 broken on cygwin, plus workaround

[Dan Kegel]

If you're used to
  pip install virtualenv
  virtualenv foo
working, but it recently started failing with
  ...
  File "/usr/lib/python2.6/site-packages/virtualenv.py", line 1506, in
install_python
  raise e
  OSError: [Errno 2] No such file or directory
you may be suffering from
  https://github.com/pypa/virtualenv/issues/373

A workaround that worked for me was to roll back virtualenv from 1.8.4
to 1.8.2, e.g.
$ pip uninstall virtualenv
$ pip install virtualenv==1.8.2

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