[postgis-tickets] [PostGIS] #4014: Address warnings across liblwgeom/ and postgis/

[PostGIS]

#4014: Address warnings across liblwgeom/ and postgis/
------------------------+---------------------------
 Reporter:  Algunenano  |      Owner:  pramsey
     Type:  defect      |     Status:  new
 Priority:  medium      |  Milestone:  PostGIS 2.5.0
Component:  postgis     |    Version:  trunk
 Keywords:              |
------------------------+---------------------------
 Address warnings in the `liblwgeom` and `postgis` folders that appear
 with GCC or Clang.

 PR: https://github.com/postgis/postgis/pull/207

 Main issues were:
 - Unused parameters: I've removed when it was clear or used
 `__attribute__((__unused__))` if there might be a reason (consistency /
 configure versions) for the parameters to stay.
 - Some int vs int32_t issues.
 - Some fall through statements.

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/4014>
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