[MacPorts] #29514: pkgconfig 0.26 update

[MacPorts]

#29514: pkgconfig 0.26 update
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 Reporter:  ryandesign@…             |       Owner:  ryandesign@…           
     Type:  update                   |      Status:  new                    
 Priority:  Normal                   |   Milestone:                         
Component:  ports                    |     Version:                         
 Keywords:                           |        Port:  pkgconfig              
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Comment(by ryandesign@…):

 Previous patch didn't actually work when pkgconfig wasn't already
 installed. New patch adds necessary configure environment variables.

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Ticket URL: <https://trac.macports.org/ticket/29514#comment:8>
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