Fix #5484

git-svn-id: https://svn.osgeo.org/gdal/trunk/gdal@27399 f0d54148-0727-0410-94bb-9a71ac55c965
Describe closed-source third-party libraries as proprietary, instead of commercial (Ticket #5487)

git-svn-id: https://svn.osgeo.org/gdal/trunk/gdal@27400 f0d54148-0727-0410-94bb-9a71ac55c965