Python: enable proj in wheels

[tmi]

Enables proc for the python wheel -- relying on a brew install on mac, building custom on linux

[codecov-commenter]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 65.76%. Comparing base (1f6c1f0) to head (61b8731).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #229      +/-   ##
===========================================
- Coverage    65.77%   65.76%   -0.01%     
===========================================
  Files         1131     1131              
  Lines        57406    57406              
  Branches      4337     4337              
===========================================
- Hits         37756    37755       -1     
- Misses       19650    19651       +1     

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