[postgis-tickets] [PostGIS] #4630: Remove WARNFLAGS

[PostGIS]

#4630: Remove WARNFLAGS
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 Reporter:  Algunenano   |      Owner:  Algunenano
     Type:  enhancement  |     Status:  assigned
 Priority:  medium       |  Milestone:  PostGIS 3.1.0
Component:  postgis      |    Version:  master
 Keywords:               |
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 As with #4629, this flags are not used in multiple folders since they are
 not standard.

 I suggest dropping them completely, whoever is building the projects is
 free to add them to their CFLAGS if they want. They are only useful in CI
 if they are matched with -Werror to force the build to fail as otherwise
 they are not checked.

 OTOH, if we wanted to keep them I'd rather move the output to add them to
 the CPPFLAGS so they are included everywhere, not just where we remembered
 to add WARNFLAGS manually.

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/4630>
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