to find ref-counted classes being managed via other smart pointer
classes.
Hopefully prevent needing fixes like
642ae256
"ChangedUIEventListener is refcounted, mustn't be helt by unique_ptr"

Change-Id: I6b0c5f8f87ce3546a8a1104ce1000470c09459bd
Reviewed-on: https://gerrit.libreoffice.org/39378Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>