In particular, the STR_SVT_MIMETYPE defines are dead
since
    commit 1b694dad
    Date:   Thu Aug 24 22:14:27 2017 +0200
    loplugin:unusedmethods

Change-Id: I641ec0a14efedc55c9d6a4de4a28784c273602e9
Reviewed-on: https://gerrit.libreoffice.org/47464Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>