[MacPorts] #42531: snort: update to 2.9.6.0

[MacPorts]

#42531: snort: update to 2.9.6.0
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  Reporter:  jul_bsd@…    |      Owner:  markd@…
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  snort        |
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Comment (by jul_bsd@…):

 3 more changes
 * use latest gcc49
 * use destroot.keepdirs, no more turf
 * change config dit to $prefix/share/examples/snort and add a post-
 activate to put in etc if no pre-existing file

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Ticket URL: <https://trac.macports.org/ticket/42531#comment:2>
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