[MacPorts] #34231: ImageMagick: should not depend on pango + fix openMP

[MacPorts]

#34231: ImageMagick: should not depend on pango + fix openMP
--------------------------+------------------------
  Reporter:  devernay     |      Owner:  ryandesign
      Type:  defect       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.0.4
Resolution:               |   Keywords:  haspatch
      Port:  ImageMagick  |
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Comment (by kencu):

 Once an Xcode-supplied clang supports `openmp` then there will be a
 reasonable push on to figure out the whole `openmp` setup properly.

 Basically, software that uses libraries built with openmp support needs to
 be built with compilers that support openmp as well. It will need
 something like the cxx11 1.1 PG approach to make sure a proper compiler is
 selected, flags enabled, link libraries passed in, etc.

 And some software, like ImageMagick, is just broken when trying to use
 openmp and clang (see many other tickets over the past six months where
 this was worked on).

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Ticket URL: <https://trac.macports.org/ticket/34231#comment:8>
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