[MacPorts] #51310: ImageMagick: update to 7.x

[MacPorts]

#51310: ImageMagick: update to 7.x
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  Reporter:  mopihopi     |      Owner:  ryandesign
      Type:  update       |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  ImageMagick  |
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Comment (by josephsacco):

 There are currently 73 ports that list ImageMagick as a dependency [see
 attachment].  Given a build-bot, one could use the hammer-and-tongs
 approach to determine if any of these ports are adversely affected by
 upgrading ImageMagick from 6.x to 7.x.

 -Joseph

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Ticket URL: <https://trac.macports.org/ticket/51310#comment:53>
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