[postgis-tickets] [PostGIS] #4013: check_gdal: Don't assume failure when the datapath is invalid

[PostGIS]

#4013: check_gdal: Don't assume failure when the datapath is invalid
------------------------+---------------------------
 Reporter:  Algunenano  |      Owner:  pramsey
     Type:  defect      |     Status:  new
 Priority:  medium      |  Milestone:  PostGIS 2.5.0
Component:  postgis     |    Version:  trunk
 Keywords:              |
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 From gdal cpl_findfile.cpp (https://git.io/vAebm) if GDAL_DATA is not
 found some system folders can be used to look for resources, so unsetting
 the variable does not necessarily mean failing to find the supported SRs.

 I sent an email to the dev list about it
 (https://lists.osgeo.org/pipermail/postgis-devel/2018-January/026811.html)
 and the suggestion was to replace it with a SET/SHOW so here is the PR:
 https://github.com/postgis/postgis/pull/206

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/4013>
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