[postgis-tickets] [PostGIS] #4296: Use `server_version_num` instead of parsing version()

[PostGIS]

#4296: Use `server_version_num` instead of parsing version()
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 Reporter:  Algunenano  |      Owner:  Algunenano
     Type:  defect      |     Status:  assigned
 Priority:  medium      |  Milestone:  PostGIS 2.3.9
Component:  postgis     |    Version:  2.3.x
 Keywords:              |
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 Some PostgreSQL forks (e.g. `EnterpriseDB`) modify the version() output so
 matching `PostgreSQL ([0-9\.]+)` doesn't work. This affects
 `postgis_extension_remove_objects` and `_postgis_pgsql_version` functions.

 Using `SELECT current_setting('server_version_num')` should be equivalent
 and clearer.

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/4296>
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