[MacPorts] #49712: vim: Move to github releases

[MacPorts]

#49712: vim: Move to github releases
-------------------------+----------------------
 Reporter:  eborisch@…   |      Owner:  raimue@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:  2.3.4
 Keywords:  haspatch     |       Port:  vim
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 Vim now has an official github (vim/vim) repository; the provided patch
 (in addition to updating to .922) moves the Portfile over to using this.
 This makes the fetch/checksum process much simpler.

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Ticket URL: <https://trac.macports.org/ticket/49712>
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