gnome: work around yelp's cups dependency

gnome/Makefile.inc

@@ -13,6 +13,7 @@ preinstall = mkdir -p "$(CHROOT)/var/lib/dbus";                           \
 		chroot $(CHROOT) /usr/bin/layman --add gnome;                     \
 		echo "source /var/lib/layman/make.conf" >>                        \
 			$(CHROOT)/etc/make.conf;                                      \
+        echo USE='"$$USE clutter"' >> $(CHROOT)/etc/make.conf;              \
 	fi;
 
 postinstall = rm -f "$(CHROOT)"/var/lib/dbus/machine-id;                  \

gnome/package.use

@@ -26,3 +26,4 @@ gnome-extra/evolution-data-server ssl
 net-libs/xulrunner cups
 net-print/cups gnutls
 app-text/poppler utils
+app-text/ghostscript-gpl cups