sm(4) on OpenBSD

The text 1f7655df9b46, as OpenBSD 5.0, OpenBSD 4.9, OpenBSD 4.8, OpenBSD 4.7, OpenBSD 4.6, OpenBSD 4.5, OpenBSD 4.4 shipped it.

SMC91C9x and SMC91C1xx-based 10/100 Ethernet device