[cairo] pixman 0.12.8 and later fail image transform tests

[Keith Packard]

I'm sitting here releasing pixman 0.13.2 and tested it against current
cairo bits. I'm getting three unexpected failures:

image (argb32): 3 failed - rotate-image-surface-paint scale-offset-image
scale-offset-similar

(same on rgb24)

It looks like the nearest neighbor point sampling code is not working
right (the old results look much nicer than the new ones), but of
course, I'm not sure which is correct.

I can't find any pixman version which builds with current cairo and
which gives correct results.

-- 
keith.packard at intel.com
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