Avoid relying on Node’s internals

`process.binding()` is not a public API, and should
not be used.

Luckily, Node recently introduced an API that does
exactly what Webpack needs:
https://nodejs.org/api/modules.html#modules_module_builtinmodules

So use that instead and keep the old path as a fallback.

lib/node/NodeTargetPlugin.js

@@ -6,9 +6,11 @@
 
 const ExternalsPlugin = require("../ExternalsPlugin");
 
+const builtins = require("module").builtinModules || Object.keys(process.binding("natives"));
+
 class NodeTargetPlugin {
 	apply(compiler) {
-		new ExternalsPlugin("commonjs", Object.keys(process.binding("natives"))).apply(compiler);
+		new ExternalsPlugin("commonjs", builtins).apply(compiler);
 	}
 }