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

[MacPorts]

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

Comment(by chad@…):

 Replying to [comment:2 blb@…]:
 > Note that the versioned database variants were deprecated a while ago in
 favor of just 'mysql' and 'postgresql' (#20854) since the specific version
 is picked when php5-mysql or php5-postgresql is installed. This of course
 means that there could be issues if an unsupported postgresql version is
 used for php5-postgresql, but I'm not sure of an easy way to test for
 that.

 Ah didn't know it had been deprecated. It shouldn't cause a problem for us
 (MW installer checks SQL version for support), it was just a housekeeping
 thing I noticed. If there's nothing really to be done here that you can
 see, feel free to resolve invalid/bogus/worksforme/etc.

-- 
Ticket URL: <https://trac.macports.org/ticket/30201#comment:3>
MacPorts <http://www.macports.org/>
Ports system for Mac OS