glamor: Fixed one segfault bug when close screen.
move the original glamor_fini to glamor_close_screen. And wrap the CloseScreen with glamor_close_screen, Then we can do some thing before call the underlying CloseScreen(). The root cause is that glamor_fini will be called after the ->CloseScreen(). This may trigger a segmentation fault at glamor_unrealize_glyph_caches() at calling into FreePicture().
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