[MacPorts] #26071: Update moodle to 1.9.9 and add postgresql variant

[MacPorts]

#26071: Update moodle to 1.9.9 and add postgresql variant
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 Reporter:  lachlan.deck@…          |       Owner:  macports-tickets@…                   
     Type:  update                  |      Status:  new                                  
 Priority:  Normal                  |   Milestone:                                       
Component:  ports                   |     Version:  1.9.1                                
 Keywords:  moodle                  |        Port:  moodle                               
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 Attaching a diff to update the moodle port to the current stable version
 of modle, 1.9.9.

 Also adding a variant for utilising postgresql.

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Ticket URL: <http://trac.macports.org/ticket/26071>
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