IOS/Socket: Delete WiiSocket's copy constructor

If the copy assignment operator is deleted, then the copy constructor
should be deleted as well, otherwise it's a hole in the API where copies
can be made (and if this were an intended case, it should be
documented).

So we delete the copy constructor and explicitly default the move
assignment and move constructor to signify this is intended to be a
move-only type.

Source/Core/Core/IOS/Network/Socket.h

@@ -175,8 +175,11 @@ class WiiSocket
 {
 public:
   WiiSocket() = default;
+  WiiSocket(const WiiSocket&) = delete;
+  WiiSocket(WiiSocket&&) = default;
   ~WiiSocket();
-  void operator=(WiiSocket const&) = delete;
+  WiiSocket& operator=(const WiiSocket&) = delete;
+  WiiSocket& operator=(WiiSocket&&) = default;
 
 private:
   struct sockop