and some more in base64.cxx

Change-Id: I31c9f23d3bd11f5482774e976a7c40025ffcfb86
Reviewed-on: https://gerrit.libreoffice.org/46157Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>