Added missing object deletions.

src/main.cpp

@@ -1635,6 +1635,7 @@ static void cleanSuperTuxKart()
     // FIXME: do we need to wait for threads there, can they be
     // moved further up?
     Online::ServersManager::deallocate();
+    STKHost::destroy();
     NetworkManager::kill();
 
     cleanUserConfig();

src/network/stk_host.cpp

@@ -92,6 +92,8 @@ STKHost::~STKHost()
 
     Network::closeLog();
     stopListening();
+    ProtocolManager::kill();
+
     delete m_network;
 }   // ~STKHost