[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 dark.panda+macports@…):

 PostgreSQL 9.1 has been out for a while now so it would be cool if support
 could be added to the GDAL port. I've tested the proposed Portfile changes
 against the latest GDAL Portfile and it looks good.

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Ticket URL: <https://trac.macports.org/ticket/32451#comment:4>
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