sem@ noted that it had to be dropped from xfce4-full metapackage
as this package is built on top of gstreamer 0.10 and the API it
uses was dropped from gstreamer 1.0 so it's gonna die some day;
upstream recommends xfce4-pulseaudio-plugin but it's not suitable
to some of us, like Speccyfighter; well let's add the good ol'
plugin to sysv based flavour for now and see how it holds.