ci/buildsystem_sanity_check: ensure USEMODULE is not exported
ci/buildsystem_sanity_check: ensure USEMODULE is not exported

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