Needed dependency for all packages that require the D-Bus session bus

[John (J5) Palmieri]

All packages that require the use of the D-Bus session must add a
requirement on dbus-x11.  This package brings in the dbus-launch utility
that starts the session bus.  Without it the session bus does not get
started.   It hasn't been a problem for most because comps brings in
desktop-printing which has a requirement on dbus-x11.  For those who do
not have this installed (nothing depends on desktop-printing so the
situation can come up) will not get the dbus-x11 package and any
application using the session bus will not be able to function at their
full capacity.  Thank you.

-- 
John (J5) Palmieri <johnp at redhat.com>