create OPropertyChangeListener2 as a modified copy of OPropertyChangeListener which uses std::mutex instead of osl::Mutex Change-Id: Ic6be1c62992749e4f0dd23a8c95de63dc45eba3d Reviewed-on: https://gerrit.libreoffice.org/c/core/+/147430 Tested-by: Jenkins Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>