ext/sockets: Adding TCP_FUNCTION_BLK socket option for FreeBSD.

Allows to select an alternate TCP stack. For example with RACK,
a fast loss detection relying on timestamp per packet.

ext/sockets: Adding TCP_FUNCTION_BLK socket option for FreeBSD.

Allows to select an alternate TCP stack. For example with RACK,
a fast loss detection relying on timestamp per packet.

While it works system-wide, it can also apply in an individual socket level too.

close GH-16842

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