CURLOPT_POST(3) on macOS

The text 7d5d21040761, 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.

request a HTTP POST

CURLOPT_POST(3) on macOS now