iox-#1196 Introduce and fix warnings in posh tests

[FerdinandSpitzschnueffler]

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Notes for Reviewer

This PR introduces the warnings in CMakeLists.txt for posh tests and fixes them.

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1. All open points are addressed and tracked via issues

References

• Partially closes Enable clang-tidy checks and fix warnings in code #1196

[MatthiasKillat]

OK, I am just not sure about the pid_t change.

[MatthiasKillat]

The more I see this #pragma sequence the more I think we should define some abbreviation macro for this (or let the compiler ignore it on a global level if possible. Can be decided in a separate PR though, fine for now.

[codecov]

Codecov Report

Merging #1455 (de29541) into master (1e1ac61) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1455      +/-   ##
==========================================
- Coverage   78.75%   78.75%   -0.01%     
==========================================
  Files         377      377              
  Lines       14490    14490              
  Branches     2011     2011              
==========================================
- Hits        11412    11411       -1     
- Misses       2438     2439       +1     
  Partials      640      640              

Flag	Coverage Δ
unittests	78.41% <ø> (-0.01%)	⬇️
unittests_timing	14.88% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
iceoryx_hoofs/source/concurrent/loffli.cpp	80.00% <0.00%> (-5.72%)	⬇️
...e/iceoryx_hoofs/internal/concurrent/smart_lock.inl	94.33% <0.00%> (+1.88%)	⬆️