NMU - remove usage of CDBS

@sunweaver contents of this NMU.

Please tell me how you want to proceed for the other remaining packages:

Mike Gabriel <sunweaver@debian.org>
   impressive-display (U)
   lightdm-autologin-greeter (U)
   lightdm-remote-session-x2go (U)
   openboard-extras-nonfree (U)
   standardskriver (U)