[MacPorts] #46247: cpan2port: fix dependency checking

[MacPorts]

#46247: cpan2port: fix dependency checking
----------------------+--------------------------------
  Reporter:  mojca@…  |      Owner:  macports-tickets@…
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:           |
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Comment (by mojca@…):

 Another weird thing is that
 {{{
 cpan2port -t Sysadm::Install
 }}}
 suggest
 {{{
 port:p${perl5.major}-termreadkey
 }}}
 but we only have
 {{{
 port:p${perl5.major}-term-readkey
 }}}

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Ticket URL: <https://trac.macports.org/ticket/46247#comment:1>
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