[MacPorts] #15038: netcat uses deprecated cd command

[MacPorts]

#15038: netcat uses deprecated cd command
------------------------------+---------------------------------------------
 Reporter:  jmr at macports.org  |       Owner:  macports-tickets at lists.macosforge.org
     Type:  defect            |      Status:  new                                  
 Priority:  Normal            |   Milestone:  Port Bugs                            
Component:  ports             |     Version:                                       
 Keywords:                    |  
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 Attached patch fixes this, plus uses Tcl commands instead of `system`, and
 `use_configure no` instead of `configure {}` (so +universal correctly
 fails).

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Ticket URL: <http://trac.macosforge.org/projects/macports/ticket/15038>
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