Fix C++17 check for windows platforms

[mborland]

Closes: #1334

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.8%. Comparing base (3c232f0) to head (4856a02).
⚠️ Report is 38 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff            @@
##           develop   #1335     +/-   ##
=========================================
+ Coverage     98.8%   98.8%   +0.1%     
=========================================
  Files          279     279             
  Lines        18134   18134             
  Branches      1932    1932             
=========================================
+ Hits         17912   17913      +1     
+ Misses         222     221      -1     

see 1 file with indirect coverage changes

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