Rollup: Added glconstants() back.

utils/build/rollup.config.js

@@ -261,6 +261,7 @@ export default [
 	{
 		input: 'src/Three.js',
 		plugins: [
+			glconstants(),
 			glsl(),
 			buble( {
 				transforms: {
@@ -307,6 +308,7 @@ export default [
 	{
 		input: 'src/Three.js',
 		plugins: [
+			glconstants(),
 			glsl(),
 			header()
 		],