Fix the Qt 5 version required to run the IncompatibleQt test.

The commit to add the INTERFACE_QT_MAJOR_VERSION in qtbase.git
is 14054d45 (Set the INTERFACE_QT_MAJOR_VERSION to 5., 2013-03-16)
which will be part of Qt 5.1.0.

If there is a Qt 5.0.3 release, there is no guarantee it will
contain that commit. Make sure such a Qt version does not fail
with this test if not.
Merge topic 'fix-Qt5-incompatibility-check-version' into next

535e53c Fix the Qt 5 version required to run the IncompatibleQt test.