polkit: drop some unneeded actions
Both org.freedesktop.udisks2.filesystem-mount-system
and
org.freedesktop.RealtimeKit1.*
have been here since this file was
introduced in 2c1bf13a, with the
following note in the commit message:
The .rules was ported from the associated .pkla file from gdm as well.
I can't actually find a .pkla
file in gdm's history, although I
haven't looked very hard. These actions are not used by
gnome-initial-setup today; remove them.
Closes #75 (closed)