[postgis-tickets] [PostGIS] #4539: Unify libm includes

[PostGIS]

#4539: Unify libm includes
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 Reporter:  Algunenano   |      Owner:  Algunenano
     Type:  enhancement  |     Status:  assigned
 Priority:  medium       |  Milestone:  PostGIS 3.1.0
Component:  postgis      |    Version:  trunk
 Keywords:               |
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 Currently -lm is included manually in different libraries or binaries
 along the project, but some other objects are missing it.

 I think it'd simpler to just include it in the LDFLAGS during configure
 and remove any manual additions for 3.1.

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/4539>
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