[postgis-tickets] [PostGIS] #4022: Drop cstring2text and text2cstring in favor of Postgresql functions

[PostGIS]

#4022: Drop cstring2text and text2cstring in favor of Postgresql functions
-------------------------+---------------------------
 Reporter:  Algunenano   |      Owner:  pramsey
     Type:  enhancement  |     Status:  new
 Priority:  medium       |  Milestone:  PostGIS 2.5.0
Component:  postgis      |    Version:  trunk
 Keywords:               |
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 To avoid future issues (as discussed in
 https://github.com/postgis/postgis/pull/211) I've changed all calls of
 `cstring2text` / `text2cstring` for cstring_to_text / `text_to_cstring`
 from `utils/builtins.h`.

 As `lwgeom_in_geojson.c` can't include both `json-c/json.h` and
 `utils/builtins.h` I've moved the old declarations there and left a
 warning since I'm pretty sure that error will come up in the future.

 PR: https://github.com/postgis/postgis/pull/213

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/4022>
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