Just the bare minimum, so that the binary file-related member functions
of the package interface are triggered, so I can implement them.

Change-Id: I996659126667423fded1f89f8097ac726418fa00
Reviewed-on: https://gerrit.libreoffice.org/41261Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>