[MacPorts] #27239: update dovecot2 to 2.0.7

[MacPorts]

#27239: update dovecot2 to 2.0.7
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 Reporter:  brad@…            |       Owner:  macports-tickets@…                   
     Type:  update            |      Status:  new                                  
 Priority:  Normal            |   Milestone:                                       
Component:  ports             |     Version:  1.9.2                                
 Keywords:                    |        Port:  haspatch                             
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 also adding postgresql90 variant

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Ticket URL: <https://trac.macports.org/ticket/27239>
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