AppVeyor: do not use ccache
AppVeyor: do not use ccache

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