altos: Clean up usage of serial port for stdio
authorKeith Packard <keithp@keithp.com>
Fri, 1 Apr 2011 21:12:56 +0000 (14:12 -0700)
committerKeith Packard <keithp@keithp.com>
Fri, 1 Apr 2011 21:12:56 +0000 (14:12 -0700)
Code wanting to use this must invoke ao_add_stdio; that way
the link can be configured before command processing starts.

Signed-off-by: Keith Packard <keithp@keithp.com>

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