Remove dependency on distutils, fixes #657

[robtaylor]

Replace using find_executable from distutils with which from shutil

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.45%. Comparing base (f5a2de4) to head (e29d3cb).
Report is 20 commits behind head on develop.

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #664      +/-   ##
===========================================
+ Coverage    96.24%   96.45%   +0.21%     
===========================================
  Files           41       41              
  Lines         5220     5220              
  Branches      1226     1226              
===========================================
+ Hits          5024     5035      +11     
+ Misses         124      110      -14     
- Partials        72       75       +3     

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