makefiles/jlink: export JLINK_IF to required targets
makefiles/jlink: export JLINK_IF to required targets

miri64/RIOT,jasonatran/RIOT,jasonatran/RIOT,kaspar030/RIOT,yogo1212/RIOT,kaspar030/RIOT,OTAkeys/RIOT,kYc0o/RIOT,basilfx/RIOT,RIOT-OS/RIOT,miri64/RIOT,OTAkeys/RIOT,ant9000/RIOT,OTAkeys/RIOT,jasonatran/RIOT,OlegHahm/RIOT,ant9000/RIOT,ant9000/RIOT,ant9000/RIOT,OTAkeys/RIOT,miri64/RIOT,kaspar030/RIOT,basilfx/RIOT,authmillenon/RIOT,OTAkeys/RIOT,yogo1212/RIOT,RIOT-OS/RIOT,OlegHahm/RIOT,miri64/RIOT,yogo1212/RIOT,OlegHahm/RIOT,OlegHahm/RIOT,yogo1212/RIOT,kYc0o/RIOT,kYc0o/RIOT,jasonatran/RIOT,OlegHahm/RIOT,basilfx/RIOT,kaspar030/RIOT,kYc0o/RIOT,authmillenon/RIOT,kYc0o/RIOT,authmillenon/RIOT,RIOT-OS/RIOT,yogo1212/RIOT,authmillenon/RIOT,jasonatran/RIOT,RIOT-OS/RIOT,yogo1212/RIOT,ant9000/RIOT,authmillenon/RIOT,RIOT-OS/RIOT,basilfx/RIOT,kaspar030/RIOT,miri64/RIOT,authmillenon/RIOT,basilfx/RIOT