Get it builing on OpenBSD 5.3

Turns out 4.8 and 5.3 offer mutually incompatible kvm_getprocs
interfaces. kvm_getproc2 was removed at some point, and kvm_getprocs
changed to have the API that kvm_getproc2 used to have.

I've decided to sac 4.8 support. devio.us still runs 4.8, but their
ulimit is set too low for vere anyway.

This reverts commit b9a83028891652e2e994f7c0a1cbb992c647f145.
Merge pull request #77 from mrdomino/master

Get it builing on OpenBSD 5.3