Problem with check_disk pthread checks (#1377)

The pthread code added to check_disk in 6986aa1 isn't portable and results
in timeouts at least on OpenBSD. I asked for advice about it and had a nice
detailed reply explaining the situation
(https://marc.info/?l=openbsd-tech&m=144421743119272&w=2).

I had a look at fixing it and have something which "works" but isn't
correct, but looking at druchoo's comment on the commit on github, I wonder
if it works as expected at all anyway?

-- 
Reply to this email on GitHub:
https://github.com/monitoring-plugins/monitoring-plugins/issues/1377