Fix building examples

[vil02]

After #553, CodeQL is failing.

This is an attempt to fix it.

It turned out that linking pthread, ssl, crypto and z is no loner needed, so I removed it.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.07%. Comparing base (d5549b2) to head (32bd1ea).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #558   +/-   ##
=======================================
  Coverage   97.06%   97.07%           
=======================================
  Files          98       98           
  Lines       11291    11291           
  Branches      796      796           
=======================================
+ Hits        10960    10961    +1     
+ Misses        331      330    -1     

Flag	Coverage Δ
unittests	97.07% <ø> (+<0.01%)	⬆️

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