[MacPorts] #27928: Upgrade mercurial to 1.7.3

[MacPorts]

#27928: Upgrade mercurial to 1.7.3
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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 file updates the mercurial Portfile to install mercurial
 1.7.3

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Ticket URL: <https://trac.macports.org/ticket/27928>
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