[osg-submissions] Fix for nontextured ShadowMap geometry

[Paul Martz]

Hi Robert -- as you and J-S and I have been discussing on osg-users, this
submission changes the clamp mode for the fake white texture applied to
non-textured geometry. CLAMP_TO_EDGE will keep the geometry a consistent
color across the entire texture coordinate range.
 
Paul Martz
Skew Matrix Software LLC
http://www.skew-matrix.com <http://www.skew-matrix.com/> 
303 859 9466
 
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