st/nine: Do not saturate illumination coefficients in ff
st/nine: Do not saturate illumination coefficients in ff

Fixes bad rendering of a test app.
Wine has the same behaviour.

Signed-off-by: Axel Davy <2b6ef604b998fb81662f85c329e4fc020eae8e5d@ens.fr>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler