CURLOPT_CHUNK_END_FUNCTION(3) on macOS

The text 5f8ad60fcf8a, as macOS 10.12.5, macOS 10.12.4, macOS 10.12.3, macOS 10.12.2, macOS 10.12.1, macOS 10.12 shipped it.

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CURLOPT_CHUNK_END_FUNCTION(3) on macOS now