CURLINFO_APPCONNECT_TIME(3) on macOS

The text b741afa13e55, 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.

get the time until the SSL/SSH handshake is completed

CURLINFO_APPCONNECT_TIME(3) on macOS now