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vrend: Use uint64_t to evaluate readback size

Gert Wollny requested to merge gerddie/virglrenderer:vrtend-int-overflow-readpixles into main

This is to avoid integer overflow. Bail out if the size is larger than UINT_MAX because glReadnPixels can't take larger buffers.

Closes: https://gitlab.freedesktop.org/virgl/virglrenderer/-/issues/459

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