[MacPorts] #42705: slime: should specify macport's emacs

[MacPorts]

#42705: slime: should specify macport's emacs
----------------------------+--------------------------------
 Reporter:  dtakahashi42@…  |      Owner:  macports-tickets@…
     Type:  defect          |     Status:  new
 Priority:  Normal          |  Milestone:
Component:  ports           |    Version:  2.2.1
 Keywords:                  |       Port:  slime
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 The slime's makefile implicitly uses emacs on the search path. However,
 emacs-app installs its binary outside of the search path
 ({{{${applications_dir}/Emacs.app/Contents/MacOS/Emacs}}}), so that the
 system's emacs (very old!) is selected and fail to compile slime.

 Attached patch revives {{{slime_emacs_binary}}} to choose a right emacs
 depends on the selected variant.

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Ticket URL: <https://trac.macports.org/ticket/42705>
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