Refactored libunwind linking on macos (#399)

[bkryza]

Fixes #399

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.21%. Comparing base (2f593d5) to head (7e56d09).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #402   +/-   ##
=======================================
  Coverage   90.21%   90.21%           
=======================================
  Files         152      152           
  Lines       19181    19181           
=======================================
  Hits        17305    17305           
  Misses       1876     1876           

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