[MacPorts] #30201: Drop +postgres83 variant from mediawiki

[MacPorts]

#30201: Drop +postgres83 variant from mediawiki
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 Reporter:  chad@…                  |       Owner:  blb@…           
     Type:  defect                  |      Status:  new             
 Priority:  Normal                  |   Milestone:                  
Component:  ports                   |     Version:  1.9.2           
 Keywords:                          |        Port:  mediawiki       
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Comment(by blb@…):

 'port variants mediawiki' would tell you:
 {{{
 mediawiki has the variants:
 [+]mysql
    mysql4: Deprecated variant, use just +mysql
    postgresql: Use PostGreSQL as the database backend
    postgresql83: Deprecated variant, use just +postgresql
    postgresql84: Deprecated variant, use just +postgresql
 }}}

 Figure I may leave this open in case there is a simple way to verify the
 php5-* port needed has the right variant set.

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Ticket URL: <https://trac.macports.org/ticket/30201#comment:4>
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