[osg-submissions] Fix COLLADA export of DrawArrays

[Paul Martz]

When exporting a DrawArrays PrimitiveSet, the DAE plugin computes an
incorrect nbVerticesPerPoly if the first index is not zero. The issue can be
reproduced easily with:
  osgconv cessna.osg cessna.dae
 
Examination of the resulting .dae file reveals several out-of-range tristrip
indices; viewing the .dae file in osgviewer causes a crash when OSG tries to
lookup those indices.
 
Attached resolves this issue.
 
Paul Martz
Skew Matrix Software LLC
http://www.skew-matrix.com <http://www.skew-matrix.com/> 
+1 303 859 9466
 
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