#2463, st_length on curve is on linearized geom


git-svn-id: http://svn.osgeo.org/postgis/branches/2.1@12043 b70326c6-7e19-0410-871a-916f4a2858ee
Revert accidental code committed to lwtree.*


git-svn-id: http://svn.osgeo.org/postgis/branches/2.1@12044 b70326c6-7e19-0410-871a-916f4a2858ee