gnome-base/nautilus: prepare for gvfs-1.34

gnome-base/nautilus: prepare for gvfs-1.34

gvfs-1.34 has ported recent files backend daemon from GtkRecentManager
to GBookmarkFile and thus doesn't depend on gtk+ anymore for it. As
such it also doesn't give the option to disable recent files support,
thus the IUSE will be removed in the bump. Prepare nautilus for that
change, as we just need a recent:// handled, which gvfs-1.34 still
provides just fine. gvfs[gtk] -> gvfs[gtk(+)] takes care of it.

Package-Manager: Portage-2.3.49, Repoman-2.3.10