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

[MacPorts]

#23232: zabbix: remove instructions for pre-10.4
-------------------------------------+--------------------------------------
 Reporter:  ryandesign@…             |       Owner:  markd@…           
     Type:  enhancement              |      Status:  new               
 Priority:  Normal                   |   Milestone:                    
Component:  ports                    |     Version:  1.8.2             
 Keywords:                           |        Port:  zabbix            
-------------------------------------+--------------------------------------
 zabbix has some post-install instructions specifically pointing out
 differences for pre-10.4 systems; these can be removed since MacPorts
 itself now requires 10.4 or later.

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