Add to zip FS handler default extensions array (zip, kmz, dwf, ods, xlsx) additional extensions listed in CPL_VSIL_ZIP_ALLOWED_EXTENSIONS config option. The extensions divided by comma.

git-svn-id: https://svn.osgeo.org/gdal/trunk@26646 f0d54148-0727-0410-94bb-9a71ac55c965