[issue18434] Update venv example to use setuptools

[Roundup Robot]

Roundup Robot added the comment:

New changeset f8c3d05994e4 by Vinay Sajip in branch '3.3':
Issue #18434: Updated example script to tidy up resources.
http://hg.python.org/cpython/rev/f8c3d05994e4

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<http://bugs.python.org/issue18434>
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