[MacPorts] #23232: zabbix: remove instructions for pre-10.4

[MacPorts]

#23232: zabbix: remove instructions for pre-10.4
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  Reporter:  ryandesign@…             |       Owner:  markd@…           
      Type:  enhancement              |      Status:  closed            
  Priority:  Normal                   |   Milestone:                    
 Component:  ports                    |     Version:  1.8.2             
Resolution:  fixed                    |    Keywords:                    
      Port:  zabbix                   |  
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Comment(by markd@…):

 and r62586.

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Ticket URL: <http://trac.macports.org/ticket/23232#comment:2>
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