Update x11-wm/xfce4-desktop to 4.11.3

[Olivier Duchateau]

Hi,

I've just updated the Xfce repository [1], now hosted on RedPorts.

If someone is interesting, here [2] documentation how to upgrade your desktop.

Keep in mind these libraries are still development version. 

Note: Libraries tagged '4.11' run fine with our ports tree, unlike 'trunk' branch.

Enjoy,

[1] https://redports.org/changeset/23303/olivierd/xfce4/tags
[2] https://people.freebsd.org/~olivierd/xfce-core-unstable.html

-- 
olivier