kml GetFeatureCount bForce is only used with expat. (#5414)

git-svn-id: https://svn.osgeo.org/gdal/trunk/gdal@27765 f0d54148-0727-0410-94bb-9a71ac55c965
gml - more CPL_UNUSED. (#5414)

git-svn-id: https://svn.osgeo.org/gdal/trunk/gdal@27766 f0d54148-0727-0410-94bb-9a71ac55c965