...where a return value was double-deleted if it was "complex" (i.e., generated
by callee into caller-provided memory) but not related to UNO interface types
(so doesn't need any mapping, like sequence<css.beans.Property> returned by
css.beans.XPropertySetInfo.getProperties).

Change-Id: I4cfc16ba63022686afd016ef5b64419e8dee53a4