TCP_INFO support on macOS

[brad0]

Just wanted to mention that recent macOS versions have something similar to TCP_INFO.

struct tcp_connection_info

https://developer.apple.com/documentation/kernel/tcp_connection_info

http://git.haproxy.org/?p=haproxy-2.6.git;a=commitdiff_plain;h=7747d465d54a1e367e9bf9c07c263d7f1f7fd481;hp=5c83e3a1563cd7face299bf08037e51f976eb5e3