add note on OGR WCTS security problem

git-svn-id: https://svn.osgeo.org/gdal/trunk@27688 f0d54148-0727-0410-94bb-9a71ac55c965
Moved out of main tree due to security issue and lack of maintenance.


git-svn-id: https://svn.osgeo.org/gdal/trunk@27689 f0d54148-0727-0410-94bb-9a71ac55c965
Merge branch 'trunk' into trunk_travis_macosx