consolekit: don't inherit gnome

consolekit: don't inherit gnome

By inheriting gnome this package was build-depending on
gtk-update-icon-cache-native, gconf, gconf-native, shared-mime-info and
hicolor-icon-theme for no reason.  Change this to inherit autotools pkgconfig to
reduce the build-dependencies.

Also, add a missing dbus-glib build-dependency that was previously pulled in
through something in the gnome class.

(From OE-Core rev: bde2c0ab1500976e2cb50f1526df04fb8b2cd408)

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>