build: warn upon --use-largepages config option

Emit a warning when the user configures with `--use-largepages` and/or
`--use-largepages-script-lld` informing them that the option is now
available as a Node.js runtime option once it is built.

Refs: #31063 (comment)

configure.py

@@ -1067,6 +1067,13 @@ def configure_node(o):
   else:
     o['variables']['node_use_dtrace'] = 'false'
 
+  if options.node_use_large_pages or options.node_use_large_pages_script_lld:
+    warn('''The `--use-largepages` and `--use-largepages-script-lld` options
+         have no effect during build time. Support for mapping to large pages is
+         now a runtime option of Node.js. Run `node --use-largepages` or add
+         `--use-largepages` to the `NODE_OPTIONS` environment variable once
+         Node.js is built to enable mapping to large pages.''')
+
   if options.no_ifaddrs:
     o['defines'] += ['SUNOS_NO_IFADDRS']