Fix: Racy use of flags in TCPConnecter::CheckCallbacks

conected and aborted flags are used concurrently from multiple threads.

src/network/core/tcp.h

@@ -15,6 +15,8 @@
 #include "address.h"
 #include "packet.h"
 
+#include <atomic>
+
 /** The states of sending the packets. */
 enum SendPacketsState {
 	SPS_CLOSED,      ///< The connection got closed.
@@ -61,8 +63,8 @@ public:
  */
 class TCPConnecter {
 private:
-	bool connected;             ///< Whether we succeeded in making the connection
-	bool aborted;               ///< Whether we bailed out (i.e. connection making failed)
+	std::atomic<bool> connected;///< Whether we succeeded in making the connection
+	std::atomic<bool> aborted;  ///< Whether we bailed out (i.e. connection making failed)
 	bool killed;                ///< Whether we got killed
 	SOCKET sock;                ///< The socket we're connecting with