wsdisplay(4) on OpenBSD

The text 1dc4e509ff65, as OpenBSD 5.6, OpenBSD 5.5, OpenBSD 5.4, OpenBSD 5.3, OpenBSD 5.2, OpenBSD 5.1, OpenBSD 5.0, OpenBSD 4.9 shipped it.

generic display device support in wscons