Fix #51498: imagefilledellipse does not work for large circles

We backport the respective upstream fix[1].

[1] <https://github.com/libgd/libgd/commit/ace7fd88dc7571b3aa182f6b2604292

Fix #51498: imagefilledellipse does not work for large circles

We backport the respective upstream fix[1].

[1] <https://github.com/libgd/libgd/commit/ace7fd88dc7571b3aa182f6b2604292f8461a819>

Closes GH-7329.

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