Disable Shader Scene for LimitedGLSL GPUs

This was causing problems with R300G. The GPU supports only limited
GLSL and seems not to be up to rendering the scene appropriate. So
let's better disable the OpenGL 2 branch for such GPUs. If the user
really wants to use it, there is the GLES backend which does not
check for limited GLSL.
BUG: 274457
CCBUG: 274607
FIXED-IN: 4.7.0