More cherry-picks to sync with xorg-server:

Remove more redundant command option arg checks.
Avoid dumb DevicePtr casts.

Cherry-pick to sync with xorg-server:

Inform detected keyboard type and layout via LogMessage().
Remove a leftover variable for non-XKB autorepeat.
Remove redundant command option arg checks.
Put probed framebuffer info to a log file by default.

Sync with xorg-server:

> Call LogInit() for logging to /var/log/Xsun.%s.log as Xorg server.

Import WIP Xorg-Server-1.10'fied ancient monolithic Xsun servers.

There are still several issue especially around XKB stuff,
but both Xsun and XsunMono servers are confirmed working with
bwtwo on 3/60 and tme, and also cgtwo on tme.
See my port-sun3@ posts for more details:
https://mail-index.netbsd.org/port-sun3/2020/07/17/msg000157.html

Note a newer Xorg Server 1.20 based version is also ready
so these 1.10 sources are imported as referenece for people
who will try to port other X11R6 servers.