altos/scheme: Accept more escaped character constants
authorKeith Packard <keithp@keithp.com>
Thu, 4 Jan 2018 10:27:11 +0000 (02:27 -0800)
committerKeith Packard <keithp@keithp.com>
Thu, 4 Jan 2018 10:27:11 +0000 (02:27 -0800)
Allow all those specified in r7rs

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

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