Fix compilation on MSVC 2019

[RippeR37]

This commit fixes the compilation on older MSVC 2019 (19.29) by converting two
warnings that were treated as errors back to warnings. This problems doesn't occur
on newer MSVC 2022 and probably is resolved on glog's master or in one of the
maintained forks (ng-log or Abseil Logging).

For v1.2.0 we should probably update/change the dependency to one of those
to stay with maintained dependencies.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.37%. Comparing base (b981622) to head (73cf093).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop      #60   +/-   ##
========================================
  Coverage    59.37%   59.37%           
========================================
  Files           57       57           
  Lines         1472     1472           
  Branches        87       87           
========================================
  Hits           874      874           
  Misses         598      598           

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