[MacPorts] #46247: cpan2port: fix dependency checking

[MacPorts]

#46247: cpan2port: fix dependency checking
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  Reporter:  mojca      |      Owner:  (none)
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:
      Port:  cpan2port  |
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Comment (by mf2k):

 See #56907.

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Ticket URL: <https://trac.macports.org/ticket/46247#comment:7>
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