[MacPorts] #35104: fix for opendkim crashing on darwin 9

[MacPorts]

#35104: fix for opendkim crashing on darwin 9
--------------------------------+-------------------------------------------
 Reporter:  dluke@…             |       Owner:  pixilla@…           
     Type:  enhancement         |      Status:  new                 
 Priority:  Normal              |   Milestone:                      
Component:  ports               |     Version:  2.1.1               
 Keywords:                      |        Port:  opendkim            
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 I've been running opendkim (2.6.2) outside of MacPorts on a Darwin 9 (ppc)
 box.

 It appears that the resolver on darwin9 isn't thread safe, so opendkim
 crashes a lot (and even manages to kernel panic the machine).

 I've got a simple patch to configure.ac that fixes it there. I'm not sure
 about the thread safety of the resolver on later darwin releases, though
 (this might be needed for more recent OS releases as well).

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Ticket URL: <https://trac.macports.org/ticket/35104>
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