Using libunwind for mac, since backtrace do not expect thread context…

[saf-e]

… (i.e. working just with current thread)

skip-changelog

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 55.00000% with 27 lines in your changes missing coverage. Please review.

Project coverage is 82.14%. Comparing base (d431ab9) to head (03eec55). Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1088 +/- ## ========================================== - Coverage 82.38% 82.14% -0.25% ========================================== Files 53 53 Lines 7751 7811 +60 Branches 1216 1238 +22 ========================================== + Hits 6386 6416 +30 - Misses 1253 1263 +10 - Partials 112 132 +20 ```

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