[cairo] Pixman refactoring, ARM and Altivec implementations needed

[Jonathan Morton]

> Attached is the very nontrivial patch which contains just the
> integration of ARM-SIMD and ARM-NEON.

I did a bit more work and produced a more complete patch.  This should
apply and work without extra effort, but still only deals with the ARM
targets.

-- 
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From: Jonathan Morton
      jonathan.morton at movial.com

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