Create a sequential torrent data fetching strategy

Change-Id: I465297bfa3b8c4c8e6e7f7cd028b2d4afeb4e669
Refs: #3507
diff --git a/src/fetching-strategy-manager.hpp b/src/fetching-strategy-manager.hpp
index 3963c75..53de939 100644
--- a/src/fetching-strategy-manager.hpp
+++ b/src/fetching-strategy-manager.hpp
@@ -39,7 +39,7 @@
      * @brief Class Destructor
      */
     virtual
-    ~FetchingStrategyManager() = default;
+    ~FetchingStrategyManager();
 
     /**
      * @brief Method called to start the torrent downloading
@@ -87,6 +87,11 @@
     onManifestReceived(const std::vector<Name>& packetNames) = 0;
 };
 
+inline
+FetchingStrategyManager::~FetchingStrategyManager()
+{
+}
+
 } // namespace ntorrent
 } // namespace ndn