[Bug 202139] security/nmap: make it actually work on 10.0 and up

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=202139

            Bug ID: 202139
           Summary: security/nmap: make it actually work on 10.0 and up
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: Individual Port(s)
          Assignee: ohauer at FreeBSD.org
          Reporter: trasz at FreeBSD.org
          Assignee: ohauer at FreeBSD.org
             Flags: maintainer-feedback?(ohauer at FreeBSD.org)

Created attachment 159626
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=159626&action=edit
Diff to put into files/.

The attached patch (drop intoto files/) makes Nmap SYN scanning (and perhaps
others, other than Connect scan, which already worked) work on FreeBSD 10.0 and
up.

Without it, attempt to scan ("nmap -Av -sS localhost") would result in:

sendto in send_ip_packet_sd: sendto(5, packet, 44, 0, 127.0.0.1, 16) => Invalid
argument
Offending packet: TCP 127.0.0.1:62353 > 127.0.0.1:995 S ttl=40 id=64012
iplen=11264 seq=1481935911 win=1024

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