#2674 raster missing availability info for some operators and functions used in equality operator

git-svn-id: http://svn.osgeo.org/postgis/branches/2.1@12334 b70326c6-7e19-0410-871a-916f4a2858ee
#2674 missed the operator class  hash_raster_ops in last commit

git-svn-id: http://svn.osgeo.org/postgis/branches/2.1@12335 b70326c6-7e19-0410-871a-916f4a2858ee