FIXES #708: add config directive for pkg_* cleanup on OpenBSD

[Izder456]

Standards checklist:

• [+] The PR title is descriptive.
• [+] I have read CONTRIBUTING.md
• [+] The code compiles (cargo build)
• [+] The code passes rustfmt (cargo fmt)
• [+] The code passes clippy (cargo clippy)
• [+] The code passes tests (cargo test)

fixes #708

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 5.03%. Comparing base (373cd3b) to head (1de6128).

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #753   +/-   ##
=====================================
  Coverage   5.03%   5.03%           
=====================================
  Files         37      37           
  Lines      12085   12085           
=====================================
  Hits         609     609           
  Misses     11476   11476           

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[SteveLauC]

Thanks! LGTM!