This allows the contents of the current FreeBSD VT console to be accessed
by vtspeakd(1) for example. The following sysctls are provided:
kern.vt.accessibility.feed
kern.vt.accessibility.text_chatty
kern.vt.accessibility.text_utf8
kern.vt.accessibility.col
kern.vt.accessibility.row
kern.vt.accessibility.lines
MFC after: 1 week
Sponsored by: NVIDIA Networking