[MacPorts] #42856: bro: improvements to portfile

[MacPorts]

#42856: bro: improvements to portfile
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  Reporter:  jul_bsd@…    |      Owner:  tanawts@…
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:  haspatch
      Port:  bro          |
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Comment (by jul_bsd@…):

 * trailing space
 * libmagic only for non-devel

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Ticket URL: <https://trac.macports.org/ticket/42856#comment:4>
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