[MacPorts] #32451: Add postgresql91 variant to gdal port

[MacPorts]

#32451: Add postgresql91 variant to gdal port
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 Reporter:  shirshegsm@…          |       Owner:  macports-tickets@…                   
     Type:  defect                |      Status:  new                                  
 Priority:  Normal                |   Milestone:                                       
Component:  ports                 |     Version:  2.0.3                                
 Keywords:                        |        Port:  gdal                                 
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Comment(by seanasy@…):

 This is fine with me. Can someone commit?

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Ticket URL: <https://trac.macports.org/ticket/32451#comment:5>
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