examples/gcoap: Adapt to change in ipv6_addr_split_iface
examples/gcoap: Adapt to change in ipv6_addr_split_iface

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