[MacPorts] #55163: supertux: Update to version 0.5.1

[MacPorts]

#55163: supertux: Update to version 0.5.1
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  Reporter:  mf2k      |      Owner:
      Type:  update    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:
      Port:  supertux  |
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Comment (by kencu):

 It looks like it's trying to use it's own internal version of physfs, but
 is not finding the git module checked out.

 Usually in the cmake configure log you can see the cmake variable that
 needs to be set to make it use the macports version.

 Or I guess you could check out the module with a git init phase, and use
 the internal one, but usually we try the macports one first.

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Ticket URL: <https://trac.macports.org/ticket/55163#comment:2>
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