[MacPorts] #64044: git-lfs: allow using system git

[MacPorts]

#64044: git-lfs: allow using system git
--------------------------+----------------------
 Reporter:  chrstphrchvz  |      Owner:  raimue
     Type:  defect        |     Status:  assigned
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:
 Keywords:                |       Port:  git-lfs
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 For my own uses, the `git` included with Xcode 12.4 command line tools has
 been sufficient. I encountered a repository that requires `git-lfs`. But
 MacPorts’ git-lfs currently depends on MacPorts’ git, which is not
 distributable. I think it would be desirable to not have to build git
 locally just to use MacPorts’ git-lfs, and it appears to work fine with
 system git (e.g. no broken links to MacPorts git). Can the git-lfs port
 specify the git dependency using `bin:git:git`, at least on systems with
 sufficiently recent git?

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Ticket URL: <https://trac.macports.org/ticket/64044>
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