[bug#40485] Acknowledgement (gnu: Update libxfce4ui to 4.15.2.)

[Danny Milosavljevic]

Then check the directories $PKG_CONFIG_PATH for libxfce4ui* .

In this case there's a libxfce4ui-2, which means they have changed the API
version because there was an incompatible change (previously it was
libxfce4ui-1).

So update xfce4-embed-plugin as well and hope they have adapted to the API
change (if not, we'll just get an error message again).

This will probably happen for quite a few packages, so it's gonna take some
work.

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