libobsd: remove (backport #2934)

[mergify]

Not working on CI for whatever reason. Not needed anyway.

---

This is an automatic backport of pull request #2934 done by Mergify.

[mergify]

Cherry-pick of 2edd7ca has failed:

On branch mergify/bp/0.28.x/pr-2934
Your branch is up to date with 'origin/0.28.x'.

You are currently cherry-picking commit 2edd7cae5.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by them: subprojects/libobsd.wrap

no changes added to commit (use "git add" and/or "git commit -a")

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 64.71%. Comparing base (f1632fe) to head (bef68f8).
Report is 5 commits behind head on 0.28.x.

Additional details and impacted files

@@            Coverage Diff             @@
##           0.28.x    #2947      +/-   ##
==========================================
+ Coverage   64.66%   64.71%   +0.05%     
==========================================
  Files         104      104              
  Lines       22169    22212      +43     
  Branches    10839    10868      +29     
==========================================
+ Hits        14335    14374      +39     
- Misses       5590     5594       +4     
  Partials     2244     2244              

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