...that are helpfully deleted in C++20, as now implemented at least by VS 2019
16.6.4 when using --with-latest-c++
Change-Id: Iaf80f793e73fc90768bb146c9cf3d300d6747c8c
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/99170
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>