gnu: dbus-glib: Propagate inputs dbus and glib.

* gnu/packages/glib.scm (dbus-glib): Propagate inputs dbus and glib.
* gnu/packages/audio.scm (patchage),
  gnu/packages/gnuzilla.scm (icecat),
  gnu/packages/python.scm (python-dbus): Drop inputs dbus and glib.
* gnu/packages/gnome.scm (colord, gconf, gnome-vfs, upower),
  gnu/packages/mail.scm (claws-mail),
  gnu/packages/messaging.scm (hexchat),
  gnu/packages/wicd.scm (wicd): Drop input dbus.