so we don't have to specify the source type

Change-Id: I4106705a39874a8043f0f294a11374404d6cfc3a
Reviewed-on: https://gerrit.libreoffice.org/30713Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>