Cannot install psutil with PYTHONOPTIMIZE=2

[yajo]

Steps to reproduce:

$ docker run -e PYTHONOPTIMIZE=2 -it --rm python:2-alpine pip install psutil
Collecting psutil
  Downloading psutil-5.0.1.tar.gz (326kB)
    100% |████████████████████████████████| 327kB 1.1MB/s 
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-build-UayZX7/psutil/setup.py", line 322, in <module>
        main()
      File "/tmp/pip-build-UayZX7/psutil/setup.py", line 258, in main
        description=__doc__.replace('\n', '').strip(),
    AttributeError: 'NoneType' object has no attribute 'replace'
    
    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-UayZX7/psutil/

When using PYTHONOPTIMIZE=2, __doc__ are removed from the generated *.pyo files, assuming that in a production deployment you never need the docstrings.

Could you please use an alternative method to get that docstring and make it work with maximum optimization?

Thanks!