[MacPorts] #40398: Add emacs_app variant to magit

[MacPorts]

#40398: Add emacs_app variant to magit
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 Reporter:  cubranic@…  |      Owner:  macports-tickets@…
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.2.0
 Keywords:              |       Port:  magit
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 The magit port currently depends on emacs, but it's simple to add a
 variant that uses emacs-app.

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Ticket URL: <https://trac.macports.org/ticket/40398>
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