Update webpack.config.js global object fix

addons/addon-webgl/webpack.config.js

@@ -33,7 +33,9 @@ module.exports = {
     filename: mainFile,
     path: path.resolve('./lib'),
     library: addonName,
-    libraryTarget: 'umd'
+    libraryTarget: 'umd',
+    // Force usage of globalThis instead of global / self. (This is cross-env compatible)
+    globalObject: 'globalThis',
   },
   mode: 'production'
 };