[MacPorts] #32923: GitX: use github portgroup

[MacPorts]

#32923: GitX: use github portgroup
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 Reporter:  ryandesign@…             |       Owner:  cal@…           
     Type:  enhancement              |      Status:  new             
 Priority:  Normal                   |   Milestone:                  
Component:  ports                    |     Version:  2.0.3           
 Keywords:  haspatch                 |        Port:  GitX            
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 This patch simplifies the GitX portfile by using the new github portgroup.
 If you have ports of other software hosted at github, consider using the
 portgroup there as well.

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Ticket URL: <https://trac.macports.org/ticket/32923>
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