The _XNamedRange tests are already written in C++ since commit
b9337e22.

Change-Id: I0b19653f99de108e76999629927260f1cfddeb8a
Reviewed-on: https://gerrit.libreoffice.org/41348Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>
Tested-by: Markus Mohrhard <markus.mohrhard@googlemail.com>