gluon-mesh-batman-adv: add batctl dependency to gluon-mesh-batman-adv-14

The batctl v2013.4 build was removed from the batman-adv-legacy package
as the current, upstream batctl releases work with batman-adv-legacy,
too.

As a replacement we need to add the upstream batctl dependency to
gluon-mesh-batman-adv-14 to have a batctl available again here.

Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>