add images for `barrier=spikes` (CC0) and `landuse=orchard` (https://openclipart.org/people/Anonymous/Anonymous_tree_with_fruits.svg, modified, PD)

git-svn-id: http://svn.openstreetmap.org/applications/share/map-icons@30794 b9d5c4c9-76e1-0310-9c85-f3177eceb1e4