The days dwindle down to a precious few. At 6 p.m.on Friday, Cannes is oddly silent. The tumult on the streets a week ago today is forgotten. There are empty seats at some screenings. The locals of Cannes know this is the time to stand in the ticket lines. The daily editions of Varsity and Hollywood Reporter ceased Thursday. Friends are in Paris, or London, or home. Some few diehards stay for the award ceremony Sunday night.