Fix PreparedPoint::intersects signature to match the upper virtual

Thanks Mikhail Veltishchev for pointing out
See https://github.com/libgeos/libgeos/pull/33

git-svn-id: http://svn.osgeo.org/geos/trunk@3988 5242fede-7e19-0410-aef8-94bd7d2200fb
Revert "Fix PreparedPoint::intersects signature to match the upper virtual"

This reverts commit r3988
The non-broken signature introduces a discrepancy between
PreparedPoint::intersects and Point::intersects
See http://trac.osgeo.org/geos/ticket/694

git-svn-id: http://svn.osgeo.org/geos/trunk@3989 5242fede-7e19-0410-aef8-94bd7d2200fb