altos/scheme: Allow individual lisp keywords to be feature-conditional
authorKeith Packard <keithp@keithp.com>
Mon, 8 Jan 2018 07:05:02 +0000 (23:05 -0800)
committerKeith Packard <keithp@keithp.com>
Mon, 8 Jan 2018 07:05:02 +0000 (23:05 -0800)
This lets us build a smaller lisp that is just missing some aliases
for existing functionality to save rom space.

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

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