[PostGIS] #5666: Build reproducibility: timestamps in extension upgrade SQL scripts

[PostGIS]

#5666: Build reproducibility: timestamps in extension upgrade SQL scripts
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  Reporter:  James Addison  |      Owner:  strk
      Type:  defect         |     Status:  new
  Priority:  medium         |  Milestone:
 Component:  build          |    Version:  3.4.x
Resolution:                 |   Keywords:
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Comment (by robe):

 I think I'd prefer the date removed over trying to pull what configure
 gives us and relying on any format string.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5666#comment:4>
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