FileGDB: fix creation and writing of Binary fields

git-svn-id: https://svn.osgeo.org/gdal/trunk@26798 f0d54148-0727-0410-94bb-9a71ac55c965
SWIG bindings: add Feature.SetFieldBinaryFromHexString()

git-svn-id: https://svn.osgeo.org/gdal/trunk@26799 f0d54148-0727-0410-94bb-9a71ac55c965