Change raster license from v3+ to v2+. Ticket #2516

git-svn-id: http://svn.osgeo.org/postgis/branches/2.0@12059 b70326c6-7e19-0410-871a-916f4a2858ee
wrong ticket

git-svn-id: http://svn.osgeo.org/postgis/branches/2.0@12062 b70326c6-7e19-0410-871a-916f4a2858ee