I just discovered that if I run make right from Documentation/ subdir,
CRIU_VERSION is not defined so the generated man page is lacking it.

Let's fix by conditionally including ../Makefile.versions.
Signed-off-by: Kir Kolyshkin <kir@openvz.org>
Acked-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>