[MacPorts] #32922: jubatus: use github portgroup

[MacPorts]

#32922: jubatus: use github portgroup
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 Reporter:  ryandesign@…             |       Owner:  hum@…           
     Type:  enhancement              |      Status:  new             
 Priority:  Normal                   |   Milestone:                  
Component:  ports                    |     Version:  2.0.3           
 Keywords:  haspatch                 |        Port:  jubatus         
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 Here is a patch to simplify the jubatus port by using the new github
 portgroup. If you have other ports for software hosted at github, consider
 using the portgroup there as well.

 When the next version of jubatus is released and you're ready to swtich
 back to downloading a distfile instead of fetching from git, you would
 merely need to remove the `fetch.type` and `git.branch` lines and add the
 checksums.

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Ticket URL: <https://trac.macports.org/ticket/32922>
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