replace the old declare and don't implement pattern
with C++11 delete keyword

Change-Id: I10b14cece4ecaddc5f96ee098b5fa36a8782a0fc
Reviewed-on: https://gerrit.libreoffice.org/24340Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>