gnome.bbclass: remove to use oe-core's version
gnome.bbclass: remove to use oe-core's version

* suggested in [1]
* build tested from scratch with my working image [2]

[1] http://lists.linuxtogo.org/pipermail/openembedded-devel/2012-August/041157.html
[2] http://gitorious.org/schnitzeltony-oe-meta/meta-misc/blobs/master/recipes-image/xfce-full-image.bb

Signed-off-by: Andreas Müller <d72a15aaaca3a7afa855175c72dc8d2e05931e32@googlemail.com>
Signed-off-by: Koen Kooi <42e3d96910f922bdd7dd1805fe3f8aff634f391d@dominion.thruhere.net>

WindRiver-OpenSourceLabs/meta-oe-subset,WindRiver-OpenSourceLabs/meta-oe-subset