Removing a old version of our Renderer.  The history of the renderergl2
folder is that when we added it to Reaction we called it renderergl2 but
months later it was also added to ioq3 under the name rend2.   To stay
compatible with ioq3 we made the same change here.  However we neglected
to remove the old renderergl2 folder which has now become an issue since
ioq3 has now decided to rename rend2 back to renderergl2 :)