build: Fix criu depdendent parts linking

When link criu we make sure that all underlied
systems are up to day: images, syscalls, pie
part. Thus provide own targets for them and
link on a final pass.

This should fix the problem when some file
in images|syscalls|pie are changed but criu
itself is not rebuilt and relinked.

NB: Need to revisit the config/version/feature-test
generations too.

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>