bug#56487: xgselect race condition leading to abort when USE_GTK not defined

[Eli Zaretskii]

> Cc: 56487@debbugs.gnu.org
> From: Tom Gillespie <tgbugs@gmail.com>
> Date: Mon, 11 Jul 2022 19:20:02 -0700
> 
> > No, because we don't want the different GLib event dispatch behavior
> > outside of GTK with native input enabled.
> 
> Ok, got it. I'll see if I can figure out an alternate solution with that
> constraint in mind.

TIA.

> Should I split out the release_select_lock change into a separate
> patch so that we can get that merged independent of a fix for the
> abort behavior?

Yes, I think that's a good idea.