We require Q_COMPILER_RVALUE_REFS and _VARIADIC_TEMPLATES since Qt 5.7,
so remove the non-variadic version which anyway has zero test coverage.
Also drop #include <utility>, as that is included from qglobal.h already,
and drop QSKIP from test.
Change-Id: I1fc7f7068eac80ad6fd85e1d8f6d33c5c7bb67db
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>
2889ebc903