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

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.77%. Comparing base (f4477e2) to head (77d3c6c).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #229      +/-   ##
===========================================
+ Coverage    65.75%   65.77%   +0.01%     
===========================================
  Files         1131     1131              
  Lines        57391    57391              
  Branches      4337     4337              
===========================================
+ Hits         37740    37750      +10     
+ Misses       19651    19641      -10     

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