[Toybox] [PATCH] netcat: Add UNIX domain socket support (-U)

[Tom Cherry]

Other implementations of netcat support UNIX domain sockets via -U, so
this change adds it to toybox too.

Example usage:
Create ./uds as a UNIX domain socket and listen on it, forwarding
messages to bash:
> nc -U -s ./uds -L /bin/bash

Connect to ./uds as a UNIX domain socket
> nc -U ./uds
---
 toys/net/netcat.c | 65 ++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 53 insertions(+), 12 deletions(-)
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