...instead of private cppu::preInitBootstrap function

Change-Id: Id0e6fcf721b697c993e5acffaf7836452cfa9750
Reviewed-on: https://gerrit.libreoffice.org/22699Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Tor Lillqvist <tml@collabora.com>
Tested-by: Tor Lillqvist <tml@collabora.com>