[cairo] [PATCH] Performance patch for bo intersections

[Baz]

Hi,
as requested Carl, this passes make test for me. I just added a couple
of simple heuristic checks for intersecting segments - if their
bounding boxes don't intersect, they can't intersect, and if the
endpoints of segments are coincident, they don't intersect (if I
understand correctly this is because they are start/end points).

For me this patch speeds up the world map, zrusin tests about 10%.

-Baz

PS I'm still new to git. Created this with cg-diff; is this what you want?
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