Apply gtest_force_shared_crt for MSVC only

[aobolensk]

Enable gtest_force_shared_crt only when using MSVC via a generator expression

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.15%. Comparing base (6c1e33c) to head (513db04).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #465   +/-   ##
=======================================
  Coverage   92.15%   92.15%           
=======================================
  Files          11       11           
  Lines         357      357           
  Branches      127      127           
=======================================
  Hits          329      329           
  Misses         10       10           
  Partials       18       18           

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