* serial.h (SERIAL_ASYNC): Delete.

* serial.h (SERIAL_ASYNC): Delete.
(DEPRECATED_SERIAL_FD): Delete.
(SERIAL_DEBUG): Delete.
(SERIAL_DEBUG_P): Delete.
(SERIAL_DRAIN_OUTPUT): Delete.
(SERIAL_FLUSH_OUTPUT): Delete.
(SERIAL_FLUSH_INPUT): Delete.
(SERIAL_SEND_BREAK): Delete.
(SERIAL_RAW): Delete.
(SERIAL_GET_TTY_STATE): Delete.
(SERIAL_SET_TTY_STATE): Delete.
(SERIAL_PRINT_TTY_STATE): Delete.
(SERIAL_NOFLUSH_SET_TTY_STATE): Delete.
(SERIAL_SETBAUDRATE): Delete.
(SERIAL_SETSTOPBITS): Delete.
(SERIAL_CAN_ASYNC_P): Delete.
(SERIAL_IS_ASYNC_P): Delete.
(SERIAL_UN_FDOPEN): Delete.
(SERIAL_READCHAR): Delete.
(SERIAL_CLOSE): Delete.
(SERIAL_FDOPEN): Delete.
(SERIAL_OPEN): Delete.