[MacPorts] #51981: jython: Fix issue upgrading from 2.5.2 to 2.7.0

[MacPorts]

#51981: jython: Fix issue upgrading from 2.5.2 to 2.7.0
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  Reporter:  aaron+macports@…  |      Owner:  macports-tickets@…
      Type:  defect            |     Status:  new
  Priority:  Normal            |  Milestone:
 Component:  ports             |    Version:
Resolution:                    |   Keywords:  haspatch
      Port:  jython            |
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Comment (by ryandesign@…):

 Should the cache be deleted whenever the port is upgraded? This patch will
 do that. If this is a cache that will change itself as users use the port,
 the user may not want it cleared.

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Ticket URL: <https://trac.macports.org/ticket/51981#comment:1>
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