ci/buildsystem_check: ensure JLINK_DEVICE is not exported
ci/buildsystem_check: ensure JLINK_DEVICE is not exported

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