Try to fix some compilation errors

Author: kimden

src/modes/free_for_all.cpp

@@ -308,6 +308,8 @@ std::shared_ptr<WorldPacket> FreeForAll::saveCompleteState(std::shared_ptr<STKPe
     auto packet = std::make_shared<FFAWorldCompleteStatePacket>();
     for (unsigned i = 0; i < m_scores.size(); i++)
         packet->scores.push_back(m_scores[i]);
+
+    return packet;
 }   // saveCompleteState
 
 // ----------------------------------------------------------------------------

src/network/packet_types.hpp

@@ -163,6 +163,7 @@ constexpr bool UNUSED = false;
 #define DEFINE_CLASS(Name) \
 struct Name: public Packet { \
     public: \
+        virtual ~Name() {} \
         virtual void toNetworkString(NetworkString* ns) const OVERRIDE; \
         virtual void fromNetworkString(NetworkString* ns) OVERRIDE;