Correct architectures and versions for hints

Over time, OpenBSD has kept this up-to-date locally without enough
patches going upstream.

This should bring perl in sync with reality.
Default to using OpenBSD's malloc

While perl bug #75742 successfully convinced p5p that the speed of the
OpenBSD malloc was a good enough reason to instead use perl's malloc,
the system malloc has many security features that OpenBSD users expect.

The system malloc has always been used in the base system perl.

While the is slower than the perl malloc, the OpenBSD project believes
the tradeoff is worth it and would prefer that users who need the speed
specifically ask for it.
Andrew Fresh is now a perl author