[libGD] #100 [Comment added] spurious horizontal line drawn by gdImageFilledPolygon; fix attached

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FS#100 - spurious horizontal line drawn by gdImageFilledPolygon; fix attached
User who did this - Ducky Sherwood (duckysherwood)

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Okay, I believe I have a better patch.  

There are some cases where two vertices in a row will have the same y-coordinate.  When calculating the intercept of the line, it didn't calculate the intercept (which is understandable, since rise/run is infinity when run is 0!)  

I made it so that if y1=y2, then it just uses x2 as the y-intercept.  That seems to get rid of all my horizontal line problems.

I have attached a patch and a test case.
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http://bugs.libgd.org/?do=details&task_id=100#comment317

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