Add canrunads.js as redirectable resource

Related discussion:
- 036e13101e (commitcomment-65068100)

src/js/redirect-engine.js

@@ -67,6 +67,9 @@ const redirectableResources = new Map([
     [ 'ampproject_v0.js', {
         alias: 'ampproject.org/v0.js',
     } ],
+    [ 'canrunads.js', {
+        data: 'text',
+    } ],
     [ 'chartbeat.js', {
         alias: 'static.chartbeat.com/chartbeat.js',
     } ],

src/web_accessible_resources/canrunads.js

@@ -0,0 +1,25 @@
+/*******************************************************************************
+
+    uBlock Origin - a browser extension to block requests.
+    Copyright (C) 2022-present Raymond Hill
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see {http://www.gnu.org/licenses/}.
+
+    Home: https://github.com/gorhill/uBlock
+*/
+
+(function() {
+    'use strict';
+    window.canRunAds = true;
+})();