[MacPorts] #30932: avoid using /usr/bin/pkgconfig on darwin

[MacPorts]

#30932: avoid using /usr/bin/pkgconfig on darwin
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 Reporter:  adfreed@…         |       Owner:  macports-tickets@…                   
     Type:  enhancement       |      Status:  new                                  
 Priority:  Normal            |   Milestone:  MacPorts Future                      
Component:  base              |     Version:  2.0.1                                
 Keywords:  haspatch          |        Port:                                       
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Comment(by cal@…):

 See https://bugzilla.xamarin.com/show_bug.cgi?id=1154 on the Mono
 bugtracker, where this is being tracked. Since this does not only affect
 MacPorts it really should be fixed by Mono.

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Ticket URL: <https://trac.macports.org/ticket/30932#comment:9>
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