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

[MacPorts]

#51310: ImageMagick: update to 7.x
--------------------------+------------------------
  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):

 The latest version, 7.1.1-21 build without incident and passes all of the
 built in tests:
 {{{
 ============================================================================
 Testsuite summary for ImageMagick 7.1.1-21
 ============================================================================
 # TOTAL: 87
 # PASS:  87
 # SKIP:  0
 # XFAIL: 0
 # FAIL:  0
 # XPASS: 0
 # ERROR: 0

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Ticket URL: <https://trac.macports.org/ticket/51310#comment:65>
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