cli: Fix FTBFS on kfreebsd

Update terminal handling borrowed from busybox. Do not modify any input
mode bits. Do not clear the TOSTOP mode flag.

Do the same for the example program.

Signed-off-by: Mike Miller <mtmiller@ieee.org>
Merge pull request #2 from mtmiller/fix-termios

cli: Fix FTBFS on kfreebsd