Patch for maintainerless i128 driver

[Thomas Jaeger]

I don't know if anyone's still using this hardware.  My main motivation
here is to make sure that drivers implement the various repeat modes in
exa's composite operation correctly  (that is, fall back to software if
they don't), so that cairo's performance-crippling client-side fallback
for EXTEND_PAD can hopefully disabled someday.  It'd be nice if someone
with git access could commit this patch.

Thanks,
Tom
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