[cairo] Inline functions changing their arguments

[Soeren Sandmann]

Hi André,

It turns out that passing pointers to the inline functions means they
can actually change their arguments, and over_2x128() does actually
change its alpha arguments, which is a problem in the case where alpha
is constant. See bug 17477.

Does this patch looks right to youj, and do you know if we might have
the same problem in other places?

Thanks,
Søren

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