[BUILD] Fix MinGW GCC cross compilation build on Linux for Windows

[stephan-cr]

Fixes #3659

Changes

Fix MinGW GCC cross compilation build on Linux for Windows. Linux expects lowercase header file names (Windows is case insensitive).

For significant contributions please make sure you have completed the following items:

• CHANGELOG.md updated for non-trivial changes
• Unit tests have been added
• Changes in public API reviewed

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: stephan-cr / name: Stephan Creutz (5344c9a)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.11%. Comparing base (5540dae) to head (5344c9a).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3666      +/-   ##
==========================================
+ Coverage   90.08%   90.11%   +0.03%     
==========================================
  Files         221      221              
  Lines        7135     7135              
==========================================
+ Hits         6427     6429       +2     
+ Misses        708      706       -2     

Files with missing lines	Coverage Δ
sdk/src/common/fast_random_number_generator.h	100.00% <ø> (ø)

... and 2 files with indirect coverage changes

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[marcalff]

LGTM, thanks for the fix.

[owent]

LGTM, thanks