wayland-protocols 1.31 is a new optional dependency for plasma-workspace 5.27.0

[Fusion Future]

Hi,

In 5.27.0 wayland-protocols becomes an optional dependency for 
plasma-workspace because it was added after the hard freeze date. But 
enabling wayland-protocols build dependency can make XEmbed on Wayland 
work properly.

See also: 
https://invent.kde.org/plasma/plasma-workspace/-/merge_requests/2503

and

https://bugs.kde.org/show_bug.cgi?id=448050

Please consider adding wayland-protocols 1.31 to your build environment. 
Thanks for reading.