[PostGIS] #5648: postgis_raster upgrade fails on PG16

[PostGIS]

#5648: postgis_raster upgrade fails on PG16
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  Reporter:  rdunklau  |      Owner:  robe
      Type:  defect    |     Status:  reopened
  Priority:  medium    |  Milestone:  PostGIS 3.3.6
 Component:  raster    |    Version:  3.4.x
Resolution:            |   Keywords:
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Comment (by robe):

 I rolled back this change on master, cause it was breaking our upgrade
 tests and several raster tests (with can't change guc) as noted in #5650.
 The upgrade tests failing are more mysterious to me.

 I also left a dangling variable key, but that was a separate issue which
 fixing that did not fix the underlying issue in #5650.

 I'm still checking to see if it's our tests at fault here, cause looking
 at the definition in PostgreSQL code


 {{{
 struct config_generic *
 find_option(const char *name, bool create_placeholders, bool skip_errors,
                         int elevel)
 }}}


 This code should have worked
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5648#comment:9>
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