MSVC can't create the default ctor (likely because members are pointers).
deleting default ctor will trigger gcc (4.8) fault where aggregate
initialization fails.
create ctor which does same as aggregate initialization, this also
prevents implicit creation of default ctor.

Change-Id: Ica79c7404de240f38ad18100e6dbc25f1b427960
Reviewed-on: https://gerrit.libreoffice.org/28981Reviewed-by: Jochen Nitschke <j.nitschke+logerrit@ok.de>
Reviewed-by: Luke Deller <luke@deller.id.au>
Tested-by: Luke Deller <luke@deller.id.au>