[PostGIS] #6057: Remove postgis_extension_AddToSearchPath

[PostGIS]

#6057: Remove postgis_extension_AddToSearchPath
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 Reporter:  pramsey         |      Owner:  robe
     Type:  defect          |     Status:  assigned
 Priority:  blocker         |  Milestone:  PostGIS 3.7.0
Component:  tiger geocoder  |    Version:  master
 Keywords:                  |
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 When the tiger geocoder is extracted from postgis, remove all trace of the
 postgis_extension_AddToSearchPath function from the build. It is only used
 by tiger and is the locus of some security concerns.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/6057>
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