...to avoid having to generate a temporary in e.g.
SwXParagraphEnumeration::Create (sw/source/core/unocore/unoobj2.cxx), and thus
to avoid <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79679> "[7 Regression]
[C++17] Missing destruction of temporary within constructor's
mem-initializer-list"

Change-Id: Ifaa5a6d0e9baa77a19752f54e7765783139bea95