[cairo] patch: have cairo_paint_with_alpha fall back to cairo_paint when alpha == 1

[Robert O'Callahan]

I updated our code to use paint/paint_with_alpha. Rather than try to
optimize for alpha==1 in our code I thought it might be better to push
that down into cairo.

Also, I noticed that cairo_paint applies the CTM to the pattern matrix,
but cairo_paint_with_alpha doesn't, but I'm not sure how to fix it.

Rob
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