[cairo] fix for untransformed and transformed paths of extend_pad

[Antoine Azar]

Hey all,

here's a patch I discussed with Soeren that fixes some issues with 
extend_pad inside pixman. We're basically always going the 
transformed way even without a transformation to take advantage of 
the special code there to handle the padding. Additionally we make 
sure we don't take a fast path as this would not work. I've also 
fixed a typo to correctly disable maskRepeat if the mask had a transform.

Best,
Antoine
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