makefiles/avrdude: allow setting debug server interface
makefiles/avrdude: allow setting debug server interface

OTAkeys/RIOT,smlng/RIOT,toonst/RIOT,kaspar030/RIOT,smlng/RIOT,aeneby/RIOT,kYc0o/RIOT,RIOT-OS/RIOT,ant9000/RIOT,OTAkeys/RIOT,miri64/RIOT,miri64/RIOT,miri64/RIOT,ant9000/RIOT,kYc0o/RIOT,x3ro/RIOT,kaspar030/RIOT,smlng/RIOT,smlng/RIOT,toonst/RIOT,aeneby/RIOT,kYc0o/RIOT,x3ro/RIOT,kaspar030/RIOT,mtausig/RIOT,basilfx/RIOT,authmillenon/RIOT,yogo1212/RIOT,x3ro/RIOT,basilfx/RIOT,jasonatran/RIOT,OTAkeys/RIOT,OTAkeys/RIOT,jasonatran/RIOT,aeneby/RIOT,mtausig/RIOT,miri64/RIOT,authmillenon/RIOT,josephnoir/RIOT,x3ro/RIOT,toonst/RIOT,miri64/RIOT,mtausig/RIOT,mtausig/RIOT,yogo1212/RIOT,aeneby/RIOT,yogo1212/RIOT,OlegHahm/RIOT,smlng/RIOT,kaspar030/RIOT,RIOT-OS/RIOT,authmillenon/RIOT,josephnoir/RIOT,x3ro/RIOT,yogo1212/RIOT,aeneby/RIOT,ant9000/RIOT,toonst/RIOT,ant9000/RIOT,kaspar030/RIOT,OlegHahm/RIOT,RIOT-OS/RIOT,RIOT-OS/RIOT,OTAkeys/RIOT,ant9000/RIOT,RIOT-OS/RIOT,jasonatran/RIOT,kYc0o/RIOT,yogo1212/RIOT,authmillenon/RIOT,jasonatran/RIOT,authmillenon/RIOT,jasonatran/RIOT,OlegHahm/RIOT,basilfx/RIOT,OlegHahm/RIOT,mtausig/RIOT,OlegHahm/RIOT,josephnoir/RIOT,yogo1212/RIOT,kYc0o/RIOT,josephnoir/RIOT,josephnoir/RIOT,authmillenon/RIOT,toonst/RIOT,basilfx/RIOT,basilfx/RIOT