[MacPorts] #28450: ldns: update to 1.6.8

[MacPorts]

#28450: ldns: update to 1.6.8
-------------------------------------+--------------------------------------
 Reporter:  ryandesign@…             |       Owner:  marius.rieder@…             
     Type:  update                   |      Status:  new                         
 Priority:  Normal                   |   Milestone:                              
Component:  ports                    |     Version:  1.9.2                       
 Keywords:                           |        Port:  ldns                        
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 ldns should probably be updated to 1.6.8.

 The livecheck should also be fixed; it currently doesn't work right:

 {{{
 $ port livecheck ldns
 ldns seems to have been updated (port version: 1.6.5, new version: 1.0.1)
 }}}

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Ticket URL: <https://trac.macports.org/ticket/28450>
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