[MacPorts] #30932: avoid using (mono's) /usr/bin/pkg-config on darwin

[MacPorts]

#30932: avoid using (mono's) /usr/bin/pkg-config on darwin
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 Reporter:  adfreed@…         |       Owner:  macports-tickets@…                   
     Type:  enhancement       |      Status:  new                                  
 Priority:  Normal            |   Milestone:  MacPorts 2.1.0                       
Component:  base              |     Version:  2.0.1                                
 Keywords:  haspatch          |        Port:                                       
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Changes (by jmr@…):

  * milestone:  MacPorts Future => MacPorts 2.1.0


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Ticket URL: <https://trac.macports.org/ticket/30932#comment:14>
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