[CRIU] [PATCHv2 3/2] build: rectify rebuild target

[Cyrill Gorcunov]

On Fri, Mar 18, 2016 at 02:58:22PM +0300, Dmitry Safonov wrote:
> Add back lost rebuild target.
> Don't know if someone uses it - but we should either fix
> or remove it from `make help` message.
> 
> Cc: Cyrill Gorcunov <gorcunov at openvz.org>
> Signed-off-by: Dmitry Safonov <dsafonov at virtuozzo.com>
> ---
> Note: it must be applied over "[PATCH 2/2] build: add mrproper target"

Guys, is anyone using it? If not then we can avoid adding it back.
The less code then better.