[MacPorts] #59672: Set SOURCE_DATE_EPOCH

[MacPorts]

#59672: Set SOURCE_DATE_EPOCH
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  Reporter:  ryandesign   |      Owner:  (none)
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  base         |    Version:
Resolution:               |   Keywords:
      Port:               |
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Comment (by ryandesign):

 The base version should also set the environment variable in all relevant
 phases (patch, configure, build, destroot). It should be stored in memory
 so that it only needs to be read from disk once. We might store it in a
 new option that portfiles could even override if needed.

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Ticket URL: <https://trac.macports.org/ticket/59672#comment:4>
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