lib: remove duplicated noop function

PR-URL: #24770
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Weijia Wang <starkwang@126.com>

lib/internal/bootstrap/node.js

@@ -200,7 +200,6 @@ function startup() {
   // so these are now deprecated non-ops that can be removed after one
   // major release cycle.
   if (process.platform === 'win32') {
-    function noop() {}
     const names = [
       'NET_SERVER_CONNECTION',
       'NET_SERVER_CONNECTION_CLOSE',