The kinfo_proc2 interface has been removed from OpenBSD (it was deprecated anyway), so use the correct replacement: kinfo_proc. https://bugzilla.gnome.org/show_bug.cgi?id=667591
Move OpenBSD code into its own sysdeps directory. The changes from bsd/ were becoming to hard to maintain as a #ifdef tree. This is what's currently being distributed as part of OpenBSD ports.