CURLOPT_FTPPORT(3) on macOS

The text ea02a4646dda, 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.

make FTP transfer active

CURLOPT_FTPPORT(3) on macOS now