libgsf: remove empty, unused packages.

Current version of libgsf recipe passes both --without-gnome-vfs and
--without-bonobo to configure. Because of this libgsf-gnome &
libgsf-gnome-dev are empty.

Signed-off-by: Peter Tworek <tworaz666@gmail.com>
Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>