- also add gbuild selftest to test this (and possibly more later)

Change-Id: Ia4ef41095613e596f39d107df700e929579ba45f
Reviewed-on: https://gerrit.libreoffice.org/29744Reviewed-by: Björn Michaelsen <bjoern.michaelsen@canonical.com>
Tested-by: Björn Michaelsen <bjoern.michaelsen@canonical.com>