altos: Expose a signed version of the tick count
authorKeith Packard <keithp@keithp.com>
Mon, 27 Aug 2012 20:44:35 +0000 (13:44 -0700)
committerKeith Packard <keithp@keithp.com>
Mon, 27 Aug 2012 20:44:35 +0000 (13:44 -0700)
Useful when doing time comparisons.

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

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