ati-vga: Implement fallback for pixman routines

Pixman routines can fail if no implementation is available and it will
become optional soon so add fallbacks when pixman does not work.

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Acked-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-ID: <ed0fba3f74e48143f02228b83bf8796ca49f3e7d.1698871239.git.balaton@eik.bme.hu>
3 files changed