instead of long which has platform-dependent bitlength

Change-Id: I888458d7807027e237772940d4b2cc15c2971243
Reviewed-on: https://gerrit.libreoffice.org/39434Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>