...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 such a
user-provided function was declared non-inline in an include file, the
apparently-used implicitly-defined copy functions are already inline, so why
bother with non-inline functions.)

Change-Id: Idb59d19dcf5e0873780959797daeb438cbb38ae7
Reviewed-on: https://gerrit.libreoffice.org/58072
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>