Revert to only env variable for tavis build dir
Revert to only env variable for tavis build dir

johandahlberg/arteria-packs,johandahlberg/arteria-packs,arteria-project/arteria-packs,johanherman/arteria-packs,johanherman/arteria-packs,arteria-project/arteria-packs,arteria-project/arteria-packs