[cairo] [PATCH/RFC] ARM NEON fixes for pixman

[Siarhei Siamashka]

Hi,

The attached patches make pixman usable again on ARM with NEON.

The first two patches address serious bugs (by just disabling/reverting
problematic code). The other two fix mostly minor/theoretical problems, but
would be also nice to have.

The first patch is not reformatted/renamed yet and mostly takes original code
unmodified. Reformatting can be done easily for it. One of the problems with
NEON code (and with this re-added function) are #ifdef blocks with the
intrinsics for ARM RVCT compiler. It is another potential point of failure
unless we have some real users of this code who can test it.

-- 
Best regards,
Siarhei Siamashka
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