[MacPorts] #53656: pcb: Make dbus support an optional dependancy

[MacPorts]

#53656: pcb: Make dbus support an optional dependancy
---------------------------+---------------------------------
  Reporter:  technobauble  |      Owner:
      Type:  enhancement   |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:                |   Keywords:  haspatch maintainer
      Port:  pcb           |
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Comment (by mf2k):

 It's [https://guide.macports.org/#development.practices.portstyle not very
 well documented], but it is preferred to use {{{configure.args-replace}}}
 here.

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Ticket URL: <https://trac.macports.org/ticket/53656#comment:3>
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