configure: fix linking on OpenBSD

added MRStatus::Reviewable label

It's already done for FreeBSD above, so I guess it's OK.

Long time no see for this patch. :D

https://mailman.videolan.org/pipermail/vlc-devel/2020-April/132850.html

Would --allow-shlib-undefined be enough to apply the behaviour of -z nodefs only on shared libraries and not the executable?

Your commit had way more explanation back then also, it might be a good idea to include those.

changed milestone to %4.0

added Platform::BSD label