[MacPorts] #33855: mercurial: update to 2.1.2 and add +hgk variant

[MacPorts]

#33855: mercurial: update to 2.1.2 and add +hgk variant
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 Reporter:  sean.michael.farley@…          |       Owner:  deric@…           
     Type:  update                         |      Status:  new               
 Priority:  Normal                         |   Milestone:                    
Component:  ports                          |     Version:  2.0.4             
 Keywords:  haspatch                       |        Port:  mercurial         
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Comment(by sean.michael.farley@…):

 Ok, I've updated the patch. Let me know if there's a problem.

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Ticket URL: <https://trac.macports.org/ticket/33855#comment:3>
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