[MacPorts] #55905: qgis: Update to 2.18.17

[MacPorts]

#55905: qgis: Update to 2.18.17
-------------------------+----------------------
  Reporter:  ryandesign  |      Owner:  Veence
      Type:  update      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:  haspatch
      Port:  qgis        |
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Comment (by Ryan Schmidt <git@…>):

 In [changeset:"8e7b757b819825f579032aba7c911dfb383d34b8/macports-ports"
 8e7b757b819825f579032aba7c911dfb383d34b8/macports-ports]:
 {{{
 #!ConfigurableCommitTicketReference repository="macports-ports"
 revision="8e7b757b819825f579032aba7c911dfb383d34b8"
 qgis: Use compiler_blacklist_versions portgroup

 …instead of implementing the functionality manually.

 See: https://trac.macports.org/ticket/55905
 }}}

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Ticket URL: <https://trac.macports.org/ticket/55905#comment:1>
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