[MacPorts] #23494: libsndfile-1.0.21 update

[MacPorts]

#23494: libsndfile-1.0.21 update
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 Reporter:  johan.pauwels@…          |       Owner:  perry@…           
     Type:  update                   |      Status:  new               
 Priority:  Normal                   |   Milestone:                    
Component:  ports                    |     Version:                    
 Keywords:  haspatch                 |        Port:  libsndfile        
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Comment(by jmr@…):

 The post-configure is vital for building correctly with +universal. It
 could of course be restricted to that case.

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Ticket URL: <http://trac.macports.org/ticket/23494#comment:3>
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