Mark some stuff SAL_DLLPUBLIC_RTTI in
include/vcl/metaact.hxx
in order to make ASAN happy.
Change-Id: I97febe0968bf58b9cbe60ce647f0ada25e6f4bb0
Reviewed-on: https://gerrit.libreoffice.org/84202
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>