altos/lisp: Make lambda, cond and while all have implicit progns
authorKeith Packard <keithp@keithp.com>
Fri, 18 Nov 2016 00:08:15 +0000 (16:08 -0800)
committerKeith Packard <keithp@keithp.com>
Mon, 20 Feb 2017 19:16:51 +0000 (11:16 -0800)
This lets all of these execute more than one sexpr, returning the
value of the last.

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

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