[MacPorts] #74250: racer unnecessarily adds rust dependency already added by cargo PR

[MacPorts]

#74250: racer unnecessarily adds rust dependency already added by cargo PR
--------------------------+--------------------
 Reporter:  barracuda156  |      Owner:  (none)
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.12.5
 Keywords:                |       Port:  racer
--------------------------+--------------------
 This is redundant: https://github.com/macports/macports-
 ports/blob/18196d3b89e95e5d634407e49a1edeb54066dacc/devel/racer/Portfile#L19
 (And breaking on my setup, where portgroup uses mrustc instead.)

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Ticket URL: <https://trac.macports.org/ticket/74250>
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