Several Python 3.9 packages have a wrong version number of 0.0.0

[Laurent Martin <laurent@lfmm.org>]

Hello,

I'm using Python 3.9 from Cygwin.  Some packages have a package version 
of 0.0.0 instead of their actual version which makes pip unhappy:

$ pip list  | grep 0.0.0
importlib-metadata            0.0.0
iniconfig                     0.0.0
zipp                          0.0.0

$ pip check
sphinx 4.4.0 has requirement importlib-metadata>=4.4; python_version < 
"3.10", but you have importlib-metadata 0.0.0.
importlib-metadata 0.0.0 has requirement zipp>=0.5, but you have zipp 0.0.0.

For instance, package python39-zipp has version 3.6.0 in the Cygwin 
setup file but it includes a directory named 
usr/lib/python3.9/site-packages/zipp-0.0.0.dist-info/ and in the file 
METADATA, the version is  "0.0.0".

I've identified this problem in the following packages:

python39-backports.entry_points_selectable
python39-filelock
python39-importlib-metadata
python39-iniconfig
python39-platformdirs
python39-tox
python39-zipp

Regards,

Laurent.