CSV: restore compatibility with MapServer OGR output mechanism that (wrongly) assumes that its first created field will be at index 0 (trunk only, related to RFC 41 changes)

git-svn-id: https://svn.osgeo.org/gdal/trunk@26513 f0d54148-0727-0410-94bb-9a71ac55c965
Merge branch 'trunk' into trunk_travis_macosx