[Libreoffice] smoketest now works (i.e. green) with a11y enabled and --enable-dbgutil

[Caolán McNamara]

And it was tricky to try and fix draw's a11y stuff, i.e. it suffered
from calling methods in a base class ctor which triggered calling
virtual methods on the object while not complete constructed yet,
falling into the classic c++ problem where during construction that
calls the *base* class virtual method, not the *derived* class virtual
method, i.e. http://www.artima.com/cppsource/nevercall.html

C.