netcat: Local socket support

[Ingo van Lil]

Hi there,

I have created a little patch to add support for local (Unix domain) 
socket connections to Busybox's netcat implementation. An equivalent 
feature is available in the OpenBSD version of netcat [1], which is 
packaged by Fedora. Additionally, the patch fixes a minor memleak in 
nc's server mode, where the sockaddr_and_len structure allocated by 
xsocket_stream() isn't freed.

Regards,
Ingo

[1] http://www.openbsd.org/cgi-bin/cvsweb/src/usr.bin/nc/
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