bedsides mentioning that opengl 2.0 is supported also print the actual gl version add the GL macro to the link call
bedsides mentioning that opengl 2.0 is supported also print the actual gl version
add the GL macro to the link call

git-svn-id: 83c4c97093aeea62ac982fbfd516bf9db27f5c99@2170 c36c8488-0289-0348-9b64-b301f74bd9a7

BlueBrain/Tuvok,BlueBrain/Tuvok,BlueBrain/Tuvok