[postgis-tickets] [PostGIS] #4318: Stop passing `-fPIC` manually

[PostGIS]

#4318: Stop passing `-fPIC` manually
------------------------+---------------------------
 Reporter:  Algunenano  |      Owner:  pramsey
     Type:  defect      |     Status:  new
 Priority:  medium      |  Milestone:  PostGIS 3.0.0
Component:  postgis     |    Version:  trunk
 Keywords:              |
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 `postgis/Makefile.in` and `topology/Makefile.in` are manually setting
 `-fPIC` in the CFLAGS. Instead they should be using `@PICFLAGS@` which is
 populated during `./configure`.

 For example, in my system `PICFLAGS` is set to `-fPIC -DPIC` (which
 doesn't have any impact in Postgis) but in other platforms the flags can
 be different.

 I also wonder if it's still needed if we keep the behaviour of building
 everything statically.

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/4318>
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