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...by explicitly defaulting the copy/move functions (and, where needed in turn, also a default ctor) for classes that have a user-declared dtor that does nothing other than an implicitly-defined one would do, but needs to be user- declared because it is virtual and potentially serves as a key function to emit the vtable, or is non-public, etc. Change-Id: Ib343070f809c364290d1747372508437692df5cd Reviewed-on: https://gerrit.libreoffice.org/58064 Tested-by: Jenkins Reviewed-by: Stephan Bergmann <sbergman@redhat.com>