[MacPorts] #53350: fontconfig: support mpgk/mdmg packaging

[MacPorts]

#53350: fontconfig: support mpgk/mdmg packaging
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  Reporter:  ctreleaven  |      Owner:  ryandesign
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  fontconfig  |
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Comment (by ryandesign):

 Ok, except:

 * use `xinstall` instead of `file copy` and thus avoid the need to
 separately call `file attributes`
 * use 4 spaces per indent
 * why change the long description?

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Ticket URL: <https://trac.macports.org/ticket/53350#comment:1>
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