Nmap's nc version fails to correctly do IPv4 fallback

[Quanah Gibson-Mount <quanah () zimbra com>]

Unlike the OpenBSD "nc", the version from nmap fails to correctly fall back 
to ipv4 if it is unable to connect to the ipv6 address of a system.

Using OpenBSD "nc":

[zimbra@zre-ldap003 ~]$ nc -v localhost 7171
nc: connect to localhost port 7171 (tcp) failed: Connection refused
Connection to localhost 7171 port [tcp/*] succeeded!

Using nmap's nc:
nc: connect to localhost port 7171 (tcp) failed: Connection refused

And then no fallback.  This is problematic in particular with "localhost", 
where most systems now have:

127.0.0.1   localhost localhost.localdomain localhost4 
localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 
localhost6.localdomain6

--Quanah

--
Quanah Gibson-Mount
Platform Architect
Zimbra, Inc
--------------------
Zimbra ::  the leader in open source messaging and collaboration

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