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And return 1.0 for Qt 5.6

Change-Id: Ie3e25484e20e04798e4f1277d584cbab35f31b47
Reviewed-by: J-P Nurmi <jpnurmi@theqtcompany.com>
Reviewed-by: Alessandro Portale <alessandro.portale@theqtcompany.com>
Reviewed-by: Tobias Hunger <tobias.hunger@theqtcompany.com>