ported sphere. Drawing code is still in the sphere function, that and

ported sphere. Drawing code is still in the sphere function, that and
the vertex index generating code can hopefully be abstracted away. But
first need to port the other shapes so I have a better idea of the
overlap. (sorry Sylvain! Just don't touch the sphere for now)

git-svn-id: svn+ssh://svn.code.sf.net/p/freeglut/code/trunk/freeglut/freeglut@1209 7f0cb862-5218-0410-a997-914c9d46530a