[cairo] arc_to patch version 0.0.0

[Bill Spitzak]

Behdad Esfahbod wrote:

>  except for when the arc doesn't fit, that I'm not
> sure should be reported as an error or the radius should be
> decreased.  Run the demo and you see what I mean.

Postscript (or at least ghostview) just draws the full-sized arc, with 
the connection lines going "backwards":

0 setgray
10 setlinewidth
100 100 moveto
200 100 200 200 50 arcto
200 200 lineto
stroke

300 100 moveto
400 100 400 200 150 arcto
400 200 lineto
stroke

Produces attached image.

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