since various code mixes these constants in with ErrCode values from
other code, let us just make it into real ErrCode values.

Change-Id: Ifa3d0f7526172609a44e6749bed9f730ab6b1a95
Reviewed-on: https://gerrit.libreoffice.org/38313Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>