...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: I6cd0ac297240ce868442ab7f8b4f1ba46c68d409
Reviewed-on: https://gerrit.libreoffice.org/58063
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>