Commits on Jun 2, 2021

1. Fix Pex emitting warnings about its Pip PEX venv. …

   Previously we'd see:
   ```
   rm -rf ~/.pex
   $ pex pex -cpex -opex.pex
   /home/jsirois/.venv/pex/lib/python3.9/site-packages/pex/tools/commands/venv.py:141: PEXWarning: Encountered collision building venv at /home/jsirois/.pex/venvs/short/4bd8ddd4 from /home/jsirois/.pex/pip.pex/46820cb5af0dcf9295a4e7f30184cc0e9fa063dc:
   1. /home/jsirois/.pex/venvs/7fbdc9731d96d42f0de338b2dfbc6bbed1c938e7/832e95f85413646e8b7b056ab4e60414f83d7397.01034f69a38943809913ffdfd28dd5bf/lib/python3.9/site-packages/constraints.txt was provided by:
           /home/jsirois/.pex/pip.pex/46820cb5af0dcf9295a4e7f30184cc0e9fa063dc/.deps/setuptools/constraints.txt
           /home/jsirois/.pex/pip.pex/46820cb5af0dcf9295a4e7f30184cc0e9fa063dc/.deps/wheel/constraints.txt
     pex_warnings.warn(message)
   ```

   

   jsirois committed Jun 2, 2021
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2. Fix test_pip.py for Python 2.7.

   

   jsirois committed Jun 2, 2021
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3. I really really do not <3 macOS. I want Woz back.

   

   jsirois committed Jun 2, 2021
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