The NVIDIA libGL only has dynamic symbols, so you have to pass the -D option to nm to make it list those.
As for the sunOgl* symbols, those are not part of the OpenGL standard and sound like SUN OpenGL extensions. I don't know why libgltt would be using those, but that sounds like a bug in that library. A quick search of the GLTT source from http://gltt.sourceforge.net/download.html
doesn't show any references to those symbols, and OpenSolaris doesn't seem to have a package for gltt.