[PostGIS] #6036: Use PG_MODULE_MAGIC_EXT for Pg18+

[PostGIS]

#6036: Use PG_MODULE_MAGIC_EXT for Pg18+
--------------------------+---------------------------
  Reporter:  pramsey      |      Owner:  pramsey
      Type:  enhancement  |     Status:  assigned
  Priority:  medium       |  Milestone:  PostGIS 3.7.0
 Component:  postgis      |    Version:  master
Resolution:               |   Keywords:
--------------------------+---------------------------
Changes (by pramsey):

 * milestone:   => PostGIS 3.7.0

-- 
Ticket URL: <https://trac.osgeo.org/postgis/ticket/6036#comment:1>
PostGIS <http://trac.osgeo.org/postgis/>
The PostGIS Trac is used for bug, enhancement & task tracking, a user and developer wiki, and a view into the subversion code repository of PostGIS project.