This mostly affects explicitly defaulted functions that had recently been user-
declared to silence new GCC trunk -Wdeprecated-copy.  It is not entirely clear
to me what the best approach is overall, see my mail
<http://lists.llvm.org/pipermail/cfe-commits/Week-of-Mon-20181001/245321.html>
"Re: r343285 - [cxx2a] P0641R2: (Some) type mismatches on defaulted functions
only", but lets just explicitly delete those functions for now.

Change-Id: If8c72f612f67a8feb8b03c2fb988c807e704ef03
Reviewed-on: https://gerrit.libreoffice.org/61259
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>