[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
Resolution:              |   Keywords:
      Port:  magit       |
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Comment (by cubranic@…):

 The attached patch adds a new variant to the port that has emacs-app
 instead of emacs as the runtime dependency. It also compiles .el files
 with the Emacs.app binary.

 The patch does not alter the location of installed files (i.e.,
 `${destroot}${prefix}/share/emacs/site-lisp`) because emacs-app includes
 that directory on its loadpath.

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Ticket URL: <https://trac.macports.org/ticket/40398#comment:1>
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