st/nine: Fix specular enable for alpha
st/nine: Fix specular enable for alpha

Apparently specular enable doesn't affect
the alpha channel.

Fixes https://github.com/iXit/Mesa-3D/issues/253

Behaviour comfirmed looking in wine sources.

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

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler