message: fuzz: fix gcc Woverloaded-virtual build warnings
diff: @@ -543,6 +543,12 @@ public:
  {
  }
  + FuzzedSock& operator=(Sock&& other) override
  + {
  + assert(false && "Not implemented yet.");
  + return *this;
  + }
  +
  SOCKET Get() const override
  {
  assert(false && "Not implemented yet.");
  