daap-share: Remove empty private struct and properties
daap-share: Remove empty private struct and properties

Neither are used, so no need to have them in code.

https://bugzilla.gnome.org/show_bug.cgi?id=784222

Signed-off-by: W. Michael Petullo <a17fed27eaa842282862ff7c1b9c8395a26ac320@flyn.org>

GNOME/libdmapsharing,GNOME/libdmapsharing,GNOME/libdmapsharing