[MacPorts] #31136: unbound @1.4.2 doesn't install using MacPorts 2.x because of wrong usage of add_users

[MacPorts]

#31136: unbound @1.4.2 doesn't install using MacPorts 2.x because of wrong usage of
add_users
------------------------------+---------------------------------------------
 Reporter:  cal@…             |       Owner:  snc@…                               
     Type:  defect            |      Status:  new                                 
 Priority:  Normal            |   Milestone:                                      
Component:  ports             |     Version:  2.0.99                              
 Keywords:  haspatch          |        Port:  unbound                             
------------------------------+---------------------------------------------
 The unbound Portfile uses the add_users command introduced in the 2.0
 release of MacPorts in post-destroot, however the right place for this
 keyword is outside any phase (see the squid port, which uses it
 correctly). MacPorts apparently ignores add_users in post-destroot and
 fails at the next line (xinstall) trying to use a non-existing group.

 The attached patch fixes this by moving the line in question outside of
 the post-destroot phase.

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Ticket URL: <https://trac.macports.org/ticket/31136>
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