Hopefully fixes broken tinderboxes.

Change-Id: I2297e5df9f18a444801ec2dc6dbbb098ed4d90c9
Reviewed-on: https://gerrit.libreoffice.org/54163Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Khaled Hosny <khaledhosny@eglug.org>