[cairo] patch for cairo_traps_extract_region

[Vladimir Vukicevic]

The current implementation of cairo_traps_extract_region calls union() 
in a loop to add subsequent rectangles.  This adds a new pixregion 
method to take a passed-in array of rectangles, initialize the region, 
and then call validate() on that region.

One thing I'm not clear on... pixman_region_validate returns a variable 
indicating whether any of the rectangles overlapped; if they did, does 
it fix the overlaps and just return the flag to let you know?  Right now 
I assume that it leaves in overlaps and just bail out of the 
optimization if there are any overlapping rects, but I believe Carl 
mentioned that the tessellator can potentially return overlapping traps...

    - Vlad

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