gdb: Abort if unable to start GDB server
When users enable GDB stub, we assume they intend to use it (it slows down the game a lot). If the server cannot start, we abort to save users' time troubleshooting why their GDB client can not connect.
When users enable GDB stub, we assume they intend to use it (it slows down the game a lot). If the server cannot start, we abort to save users' time troubleshooting why their GDB client can not connect.