QMetaType: Fix copy of type erased iterator

Behavior differs depending on whether the iterator is a value_type*,
or a different class entirely. Ensure that the correct behavior is
used when copying.

Task-number: QTBUG-33997

Change-Id: Ib6db2a3c4a5aa861b851833a7f0ecb855a3e828f
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>
QMetaType: Fix equality comparison of type-erased iterators.

Task-number: QTBUG-33997

Change-Id: I0d4da562540df0e3732769881ba124cb980f6b82
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>