[MacPorts] #43251: scapy Portfile improvements

[MacPorts]

#43251: scapy Portfile improvements
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  Reporter:  jul_bsd@…    |      Owner:  macports-tickets@…
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:  haspatch
      Port:  scapy        |
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Comment (by ryandesign@…):

 The graphviz dependency should remain `path:bin/dot:graphviz` and not be
 changed to `port:graphviz`; this is to allow graphviz-devel to satisfy the
 dependency.

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Ticket URL: <https://trac.macports.org/ticket/43251#comment:1>
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