after I missed a bunch of stuff when testing UBSan with
commit 3ba92b5f1e
hide more symbols
Change-Id: I0743a0c0c6abcb2904face8386e26153ae3229a3
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/163718
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>