Function SetRectEmpty

* \fn void SetRectEmpty (RECT* prc) * \brief Empties a rectangle. * * This function empties the rectangle pointed to by \a prc. * An empty rectangle in MiniGUI is a rectangle whose width and height both * are zero. This function will sets all coordinates of the rectangle to * be zero. * * \param prc The pointer to the rectangle. * * \sa SetRect */