Blender Git Loki

Blender Internal: Revert own previous commit for "Camera Data" node, correct GLSL code for view vector output of "Geometry" node.

Revert 0c7d2de38219. The "Camera Data" node actually gives the location
of the point in camera coordinate system. To obtain actual camera data,
we can use "Geometry" node instead.

Also modify the "Geometry" node, to produce correct view vector output
in orthographic GLSL preview.