AppVeyor: change QTDIR to point to default generic directory
AppVeyor: change QTDIR to point to default generic directory

qreal/qreal,ZiminGrigory/qreal,ZiminGrigory/qreal,qreal/qreal,ZiminGrigory/qreal,qreal/qreal,ZiminGrigory/qreal,qreal/qreal,qreal/qreal,qreal/qreal,qreal/qreal,ZiminGrigory/qreal,ZiminGrigory/qreal,ZiminGrigory/qreal,qreal/qreal,ZiminGrigory/qreal,qreal/qreal,ZiminGrigory/qreal