ShaderLib: Fixed physical includes.

src/renderers/shaders/ShaderLib.js

@@ -520,6 +520,7 @@ THREE.ShaderLib = {
 			THREE.ShaderChunk[ "emissivemap_pars_fragment" ],
 			THREE.ShaderChunk[ "envmap_pars_fragment" ],
 			THREE.ShaderChunk[ "fog_pars_fragment" ],
+			THREE.ShaderChunk[ "lights_pars" ],
 			THREE.ShaderChunk[ "lights_phong_pars_fragment" ], // use phong chunk for now
 			THREE.ShaderChunk[ "shadowmap_pars_fragment" ],
 			THREE.ShaderChunk[ "bumpmap_pars_fragment" ],