Bypass __PREFIX_LINKS__ checks

lib/utils/webpack.config.js

@@ -6,7 +6,7 @@ const debug = require('debug')('gatsby:webpack-config')
 import path from 'path'
 import _ from 'lodash'
 import invariant from 'invariant'
-import { prefixLink } from 'gatsby-helpers'
+import { config } from 'config'
 
 import babelConfig from './babel-config'
 
@@ -47,7 +47,7 @@ module.exports = (program, directory, suppliedStage, webpackPort = 1500, routes
         return {
           path: `${directory}/public`,
           filename: 'bundle-for-css.js',
-          publicPath: prefixLink('/'),
+          publicPath: `${config.linkPrefix}/`,
         }
       case 'build-html':
         // A temp file required by static-site-generator-plugin. See plugins() below.
@@ -56,13 +56,13 @@ module.exports = (program, directory, suppliedStage, webpackPort = 1500, routes
           path: `${directory}/public`,
           filename: 'render-page.js',
           libraryTarget: 'umd',
-          publicPath: prefixLink('/'),
+          publicPath: `${config.linkPrefix}/`,
         }
       case 'build-javascript':
         return {
           filename: 'bundle.js',
           path: `${directory}/public`,
-          publicPath: prefixLink('/'),
+          publicPath: `${config.linkPrefix}/`,
         }
       default:
         throw new Error(`The state requested ${stage} doesn't exist.`)