Support XDG Base Dir Spec 0.8.

[stefan11111]

This version of the spec (latest as of 27.12.2021) adds a variable $XDG_STATE_HOME that may be used for log files, as described:

...
$XDG_STATE_HOME defines the base directory relative to which user-specific
state files should be stored. If $XDG_STATE_HOME is either not set or
empty, a default equal to $HOME/.local/state should be used.

The $XDG_STATE_HOME contains state data that should persist between
(application) restarts, but that is not important or portable enough to
the user that it should be stored in $XDG_DATA_HOME. It may contain:

actions history (logs, history, recently used files, …)
...

• https://specifications.freedesktop.org/basedir/0.8/

Part-of: https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/836

[github-actions]

Merge Conflict found

[cepelinas9000]

I have nothing against it, maybe @NexusSfan or @artist4xlibre have comment. The point is with this change when XServer started as ordinary user. Default log directory changes from ~/.local/share/xorg to ~/.local/state/xorg

[NexusSfan]

I do have ~/.local/state and see it being used (mostly for rc files but some are logs) but $XDG_STATE_HOME is not defined.

[Samueru-sama]

I do have ~/.local/state and see it being used (mostly for rc files but some are logs) but $XDG_STATE_HOME is not defined.

When XDG_STATE_HOME is not declared a default of ~/.local/state is used so that is correct.