CURLINFO_PRIMARY_IP(3) on macOS

The text 6b5289c7d74a, 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 IP address of last connection

CURLINFO_PRIMARY_IP(3) on macOS now