Revision 54421

Track switch to libinput in xorg-server 1.20.8

Remove the Driver line from examples 5.7 and 5.9, thus making them
valid for both variant configurations of X (with or without libinput).

For 12.1 and xorg-server 1.20.8, add "Set kern.evdev.rcpt_mask=6 in
/etc/sysctl.conf if not using moused" important paragraph to section
"5.4.7.2. Mice and Pointing Devices".

PR:		244820
Submitted by:	pauamma
Reviewed by:	zeising@
Approved by:	bcr@
Differential Revision:	https://reviews.freebsd.org/D25641