...by removing explicitly user-provided functions that do the same as their
implicitly-defined counterparts, but may prevent implicitly declared copy
functions from being defined as non-deleted in the future.  (Even if a dtor was
declared non-inline in an include file, the apparently-used implicitly-defined
copy functions are already inline, so why bother with a non-inline dtor.)

Change-Id: I6de6b84ebd177f494864d7de91e538fa5a64985c
Reviewed-on: https://gerrit.libreoffice.org/58058
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>