selftest: skip virgl test on centos 8 entirely
With the sdl frontend, qemu isn't able to even boot fully,
so let's skip the test early.
Signed-off-by: 
Steve Sakoman <steve@sakoman.com>
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With the sdl frontend, qemu isn't able to even boot fully,
so let's skip the test early.
Signed-off-by: Steve Sakoman <steve@sakoman.com>