Prevents multiple `Xorg`/`/Xwayland`/`/Xephyr`/etc instances from trampling each other X11 sockets (e.g., `/tmp/.X11-unix/X0`) that maybe still in use.
PR: [253277](https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253277)
Submitted by: Olivier Certner
(based on)