Issue 6359 - use C++14 instead of C++1z

compiled/Map.h

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-present 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 297 matching lines @@
   typedef typename super::size_type size_type;
   typedef typename super::entry_type entry_type;
   typedef typename super::key_type_cref key_type_cref;
   typedef typename entry_type::value_type value_type;
   typedef typename super::const_reference const_reference;
   typedef Map_internal::MapReference<entry_type> reference;
   friend struct Map_internal::MapReference<entry_type>;
 
   using super::super;
 
+  Map()
+  {
+  }
+
   Map(std::initializer_list<entry_type> list)
       : super(list.size())
   {
     for (const auto& item : list)
       super::insert(item);
   }
 
   value_type& operator[](key_type_cref key)
   {
     entry_type* entry = super::find_bucket(key);
     if (entry->is_invalid())
       entry = super::assign(entry, key);
     return entry->second;
   }
 
   const_reference find(key_type_cref key) const
   {
     return super::find(key);
   }
 
   reference find(key_type_cref key)
   {
     return reference(this, key, super::find_bucket(key));
   }
 };
 
 ABP_NS_END