[MacPorts] #69976: Set ports tree timestamps based on commit times

[MacPorts]

#69976: Set ports tree timestamps based on commit times
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  Reporter:  jmroot          |      Owner:  admin@…
      Type:  enhancement     |     Status:  new
  Priority:  Normal          |  Milestone:
 Component:  server/hosting  |    Version:
Resolution:                  |   Keywords:
      Port:                  |
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Comment (by ryandesign):

 Why? `SOURCE_DATE_EPOCH` is supposed to be set based on the source code
 files; see https://github.com/macports/macports-base/pull/274. The
 timestamp of the Portfile or patchfiles is irrelevant.

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Ticket URL: <https://trac.macports.org/ticket/69976#comment:1>
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