Equality test failed on points with same coordinates

Equality test failed on points with same coordinates
and differing SRIDs, resulting in incorrect hashing.
Amazingly, this problem existed in *both* the btree
function and the new hash machinery (and it was the
btree machinery that was actually called for the
UNION operation).
References #1014

git-svn-id: http://svn.osgeo.org/postgis/trunk@16059 b70326c6-7e19-0410-871a-916f4a2858ee