Add dependency on debhelper.

[userv-utils] / misc / checkpasswd-self

#
if ( grep service /etc/userv/default-services-enabled
   & glob service-user root
   )
        reset
        no-set-environment
        disconnect-hup
        suppress-args
        execute checkpasswd-service /var/run/checkpasswd.synch 0.5 -- SELF
fi