Add NetBSD support

[0323pin]

Hi,

I've packaged pueue for NetBSD and the package has been merged into pkgsrc main branch.
Commit log for reference, https://mail-index.netbsd.org/pkgsrc-changes/2024/09/19/msg307405.html

Now, in order to do this, I needed to add support to the relevant files, this PR.

The software is tested and works as expected.
For the package, we are currently using my fork as upstream. Hence, I cannot squash the commits since that would generate a new checksum and break the builds on our servers. Hopefully, you can do the commit squash when merging.

Once merged, I will regenerate all checksums and shift upstream to the proper one, i.e. your master.

Thanks!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.28%. Comparing base (1c5f4aa) to head (7c5ca49).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #568      +/-   ##
==========================================
+ Coverage   78.21%   78.28%   +0.06%     
==========================================
  Files          75       75              
  Lines        5844     5835       -9     
==========================================
- Hits         4571     4568       -3     
+ Misses       1273     1267       -6     

☔ View full report in Codecov by Sentry.
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[github-actions]

Test Results

  3 files  ±0   19 suites  ±0   3m 4s ⏱️ -1s
161 tests ±0  161 ✅ ±0  0 💤 ±0  0 ❌ ±0 
340 runs  ±0  340 ✅ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit 7c5ca49. ± Comparison against base commit 1c5f4aa.

[Nukesor]

Looks good to me :)
Don't worry about the commits, as long as they're sensible, there's no need to squash.

Lints have been addressed on the main branch. Not sure why they pop up though, I don't get them on my local machines, they only show up in CI o.O

[0323pin]

Cheers!
I'll shift to your repository sometime during the weekend.