gnrc_ipv6: use fragmentation if available
gnrc_ipv6: use fragmentation if available

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