[MacPorts] #58668: dns-server: Fix netstate on Catalina

[MacPorts]

#58668: dns-server: Fix netstate on Catalina
----------------------+------------------------
 Reporter:  mf2k      |      Owner:  essandess
     Type:  defect    |     Status:  assigned
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:
 Keywords:  catalina  |       Port:  dns-server
----------------------+------------------------
 See https://github.com/macports/macports-
 ports/pull/4713#issuecomment-507355700.

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Ticket URL: <https://trac.macports.org/ticket/58668>
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