[MacPorts] #49576: Fix incorrect checksums in GMTK Portfile

[MacPorts]

#49576: Fix incorrect checksums in GMTK Portfile
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  Reporter:  rprogers@…  |      Owner:  macports-tickets@…
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:  haspatch maintainer
      Port:  gmtk        |
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Comment (by mojca@…):

 Apart from that the distfiles keep changing almost on a daily basis. I now
 see three different checksums for the same name and version of software:
  * the checksums in trunk
  * the checksums of the current file
  * the checksums that were apparently current at some point which are
 listed in `Portfile-gmtk.diff`

 This is generally a "forbidden" (or at least highly discouraged) practice
 and will not work nicely with MacPorts in the future (the port will be
 constantly broken).

 My preference would be to wait with the change until it becomes clear what
 the strategy for version updates is going to be in the future. Please
 write to the MacPorts development mailing list for advice.

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Ticket URL: <https://trac.macports.org/ticket/49576#comment:3>
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