[Bug 217558] [security/nmap] [patch] make nmap compatible with INET4-only kernels

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217558

            Bug ID: 217558
           Summary: [security/nmap] [patch] make nmap compatible with
                    INET4-only kernels
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Keywords: patch
          Severity: Affects Many People
          Priority: ---
         Component: Individual Port(s)
          Assignee: ohauer at FreeBSD.org
          Reporter: ports at grosbein.net
          Assignee: ohauer at FreeBSD.org
             Flags: maintainer-feedback?(ohauer at FreeBSD.org)
          Keywords: patch

Created attachment 180527
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=180527&action=edit
check for errno==EAFNOSUPPORT

Default build of nmap-7.40 package does not work for kernels build without
INET6 support:

# nmap -dd --iflist

Starting Nmap 7.40 ( https://nmap.org ) at 2017-03-05 16:45 +07
Fetchfile found /usr/local/share/nmap/nmap-services
PORTS: Using top 1000 ports found open (TCP:1000, UDP:0, SCTP:0)
INTERFACES: NONE FOUND(!)
Reason: getinterfaces_dnet: intf_open() failed
ROUTES: NONE FOUND(!)
Reason: getsysroutes_dnet: sysroutes_dnet_find_interfaces() failed

One-line attached patch fixes this so mentioned command works for INET4-only
kernel and also "nmap -sS" and others.

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