[Ves] compile errors on next branch

[Casey Goodlett]

Hi Aashish,

This commit ef6753d6f63277242e5ce15fcd2d88efe43cb936 on next causes
compilation problems when compiled for iOS.

I am not sure that glReadBuffer is included in opengl es 2.  Can you please
commit a fix that makes this branch compatible with opengl es 2 targets?

Thank you

-- 
Casey B. Goodlett, Ph.D.
R&D Engineer
Kitware, Inc. - North Carolina Office
http://www.kitware.com
(919) 969-6990 x310
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