Add an <a:hlinkClick> child element with r:id attribute set to *rId*.

def add_hlinkClick(self, rId):
        """
        Add an <a:hlinkClick> child element with r:id attribute set to *rId*.
        """
        hlinkClick = self.get_or_add_hlinkClick()
        hlinkClick.rId = rId
        return hlinkClick