this is useful now that we are storing UNO structs in std::vector

Change-Id: Ic558bcd669bd2b3cdf9eb8393269eb906ac52369
Reviewed-on: https://gerrit.libreoffice.org/22257Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noelgrandin@gmail.com>