Add a TCP_FASTOPEN option (default on) to allow not building it in. [1]

It is annoying because it outputs one line saying it cannot enable
TCP_FASTOPEN when the deamon starts.

While there, discover that FILTER_AAAA is always enabled in 9.12+ and no
longer an option, so remove it.

PR: 217288 [1] (based on)
Reported by: doktornotor mailinator com
Sponsored by: Absolight