CURLOPT_TRANSFER_ENCODING(3) on macOS

The text 5e8c2db7ee5f, 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.

ask for HTTP Transfer Encoding

CURLOPT_TRANSFER_ENCODING(3) on macOS now