xfsettingsd hangs with libX11 1.8.1

See:

https://gitlab.freedesktop.org/xorg/lib/libx11/-/issues/157 https://gitlab.freedesktop.org/xorg/lib/libx11/-/issues/158

Explanation from ajax here:

https://gitlab.freedesktop.org/xorg/lib/libx11/-/issues/157#note_1380268

Long story short, calling XInternAtoms from XIfEvent is wrong, and leads to a hang with newer libX11.