build.js: drop ip.js hack

Since f27fc31 we ported from the ip
module to the ipaddr.js module. ip was a pure node.js module so required
a hack to work.

build.js

@@ -6,7 +6,6 @@ import os from 'node:os';
 import process from 'node:process';
 
 import copy from 'esbuild-plugin-copy';
-import { replace } from 'esbuild-plugin-replace';
 
 import { cockpitCompressPlugin } from './pkg/lib/esbuild-compress-plugin.js';
 import { cockpitPoEsbuildPlugin } from './pkg/lib/cockpit-po-plugin.js';
@@ -101,15 +100,6 @@ const context = await esbuild.context({
                 { from: ['./src/index.html'], to: ['./index.html'] },
             ]
         }),
-        // TODO: The following HACKS are needed for ip module - replace this module with one better maintained
-        // The replacement is done as ip module imports `os` which is not in our dependencies, but since we don't use
-        // the functions using the `os` module, we can just replace it with an empty object
-        replace({
-            include: /ip.js/,
-            values: {
-                "var os": 'var os = {}; // HACK: os is not really used in our used functions from ip.js',
-            }
-        }),
         ...esbuildStylesPlugins,
         cockpitPoEsbuildPlugin(),