Fix GH-19739: imageellipse/imagefilledellipse overflow.#22116
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Port the upstream libgd portable fix (overflowMul3) for the int64 overflow at r = a * bq when w/h reach near INT_MAX. Mirrors the upstream libgd commit 0057de6.
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Port the upstream libgd portable fix (overflowMul3) for the int64 overflow at r = a * bq when w/h reach near INT_MAX. Mirrors the upstream libgd commit 0057de6.