[MacPorts] #27364: update mercurial port to 1.7.1

[MacPorts]

#27364: update mercurial port to 1.7.1
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 Reporter:  msa@…          |       Owner:  macports-tickets@…                   
     Type:  update         |      Status:  new                                  
 Priority:  Normal         |   Milestone:                                       
Component:  ports          |     Version:                                       
 Keywords:  haspatch       |        Port:  mercurial                            
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 Attached patch updates mercurial Portfile to mercurial version 1.7.1.

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Ticket URL: <https://trac.macports.org/ticket/27364>
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