[MacPorts] #23227: zabbix: add pgsql84 variant

[MacPorts]

#23227: zabbix: add pgsql84 variant
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 Reporter:  ryandesign@…             |       Owner:  markd@…           
     Type:  enhancement              |      Status:  new               
 Priority:  Normal                   |   Milestone:                    
Component:  ports                    |     Version:                    
 Keywords:                           |        Port:  zabbix            
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Comment(by ryandesign@…):

 [attachment:zabbix-databases.diff Here] is a patch to fix #23227, #23229,
 #23230, #23231, and remove unnecessary --prefix and --mandir args. I made
 mysql5 a variant too, so now every database option has a variant. This
 simplifies things and is IMHO easier for the user to understand.

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Ticket URL: <http://trac.macports.org/ticket/23227#comment:2>
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