Upgrade GDAL to 2.3.2 (#494)
Upgrade GDAL to 2.3.2 (#494)

* Upgrade GDAL to 2.3.2

* Remove unnecessary patch to SWIG makefile, which has been fully upstreamed.

OSGeo/homebrew-osgeo4mac,OSGeo/homebrew-osgeo4mac,OSGeo/homebrew-osgeo4mac