* libcsupport/include/rtems/termiostypes.h: Include stdlib.h.
Add rtems_termios_baud_t.
Rename termios_number_to_baud into rtems_termios_number_to_baud,
termios_baud_to_number into rtems_termios_baud_to_number,
termios_baud_to_index into rtems_termios_baud_to_index.