altos: Prepare for picolibc stdio change
authorKeith Packard <keithp@keithp.com>
Wed, 18 Aug 2021 03:04:08 +0000 (20:04 -0700)
committerKeith Packard <keithp@keithp.com>
Tue, 7 Sep 2021 06:07:56 +0000 (23:07 -0700)
Instead of __iob, picolibc will use stdin, stdout and stderr globals.

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

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