[Bug 232934] security/nmap: Fix build with libc++ 7.0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=232934

            Bug ID: 232934
           Summary: security/nmap: Fix build with libc++ 7.0
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: ohauer at FreeBSD.org
          Reporter: dim at FreeBSD.org
          Assignee: ohauer at FreeBSD.org
             Flags: maintainer-feedback?(ohauer at FreeBSD.org)

Created attachment 198913
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=198913&action=edit
Use ::bind instead plain bind

Building security/nmap on the clang700-import branch results in a bunch of
errors due to std::bind conflicting with the good old bind(2):

EchoServer.cc -o EchoServer.o
EchoServer.cc:284:81: error: invalid operands to binary expression ('__bind<int
&, sockaddr *, unsigned long>' and 'int')
    if( bind(master_sd, (struct sockaddr *)&server_addr6, sizeof(server_addr6))
!= 0 ){
        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
^  ~
/usr/include/c++/v1/utility:566:1: note: candidate template ignored: could not
match 'pair' against '__bind'
operator!=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
^
[... much more of this ...]

See also
http://package18.nyi.freebsd.org/data/headamd64PR230355-default/2018-10-09_18h22m03s/logs/errors/nmap-7.70.log

This is because nmap puts "using namespace std" in its headers.

Attached is a patch to replace the calls to bind(2) with ::bind.

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