Issue 5035 - Fix build on gcc 4.8

include/AdblockPlus/JsEngine.h

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2017 eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 264 matching lines @@
     struct TimerTaskInfo
     {
       ~TimerTaskInfo();
       int delay;
       std::vector<std::unique_ptr<v8::Persistent<v8::Value>>> arguments;
     };
     typedef std::list<TimerTaskInfo> TimerTaskInfos;
     struct TimerTask
     {
       std::weak_ptr<JsEngine> weakJsEngine;
-      TimerTaskInfos::const_iterator taskInfoIterator;
+      TimerTaskInfos::iterator taskInfoIterator;
     };
     TimerTask CreateTimerTask(const v8::Arguments& arguments);
-    void CallTimerTask(TimerTaskInfos::const_iterator taskInfoIterator);
+    void CallTimerTask(TimerTaskInfos::iterator taskInfoIterator);
   private:
     explicit JsEngine(const ScopedV8IsolatePtr& isolate);
 
     JsValuePtr GetGlobalObject();
 
     /// Isolate must be disposed only after disposing of all objects which are
     /// using it.
     ScopedV8IsolatePtr isolate;
 
     FileSystemPtr fileSystem;
     WebRequestPtr webRequest;
     LogSystemPtr logSystem;
     std::unique_ptr<v8::Persistent<v8::Context>> context;
     EventMap eventCallbacks;
     std::mutex eventCallbacksMutex;
     std::mutex isConnectionAllowedMutex;
     IsConnectionAllowedCallback isConnectionAllowed;
     TimerTaskInfos timerTaskInfos;
   };
 }
 
 #endif