Pull an upstream (post-21.1) fix for xf86CompatOutput().

https://gitlab.freedesktop.org/xorg/xserver/-/commit/75d70612888f18339703315549db781a22c0cb23
This is an additional fix against the previous revision that is
avaiable in 21.1 branch:
https://gitlab.freedesktop.org/xorg/xserver/-/commit/80eeff3ebac772e25c9107199989e677457dbe06
and may avoid a possible out of bounds access at least on dumb wsfb servers.

ok'ed by mrg@ on current-users@:
https://mail-index.netbsd.org/current-users/2022/07/24/msg042731.html

initial import of xorg-server-21.1.3

initial import of xorg-server-1.20.3

initial import of xorg-server-1.18.4

import xorg-server 1.9.2. important changes since 1.6.5 include:

- built-in symbol visibility, default not export
- fixes for various crashes
- many fixes for XI2, EXA, dix, render, glx, xkb, EDID, randr, Xv,
resource handling, Xext, vfb, xfree86 / vga and composite support.
- fixes several memory leaks
- many many documentation updates
- record extension enabled
- no longer looks for XF86Config files

initial import of xorg-server-1.6.5

initial import of xorg-server-1.6.1.901

initial import of xorg-server-1.4.2