fix: workaround missing SHA256 macros in MinGW-w64

[coryan]

Fixes #14436

If you need to verify the values, consider:

https://github.com/wine-mirror/wine/blob/94fd0561b740dbb94608a8c4b3e1283e345e8c7a/include/bcrypt.h#L450
https://github.com/wine-mirror/wine/blob/94fd0561b740dbb94608a8c4b3e1283e345e8c7a/include/bcrypt.h#L457

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This change is 

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.58%. Comparing base (f54ba19) to head (c801913).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #14437      +/-   ##
==========================================
- Coverage   93.59%   93.58%   -0.01%     
==========================================
  Files        2313     2313              
  Lines      206983   206983              
==========================================
- Hits       193723   193715       -8     
- Misses      13260    13268       +8     

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