Fix Bugzilla 24598

[ibara]

I would like to champion the test changes found here: #16278

This will help get more eyeballs on the tests.

[dlang-bot]

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Bugzilla references

Auto-close	Bugzilla	Severity	Description
✓	24598	enhancement	OpenBSD: adapt compiler tests

Testing this PR locally

If you don't have a local development environment setup, you can use Digger to test this PR:

dub run digger -- build "master + dmd#16577"