altos/telelco-v2.0: Do all drag race beeping from the beeping thread
authorKeith Packard <keithp@keithp.com>
Mon, 18 Jun 2018 17:53:35 +0000 (10:53 -0700)
committerKeith Packard <keithp@keithp.com>
Mon, 18 Jun 2018 17:53:35 +0000 (10:53 -0700)
Instead of starting the beep from the calling thread, just update some
state and poke the beeping thread.

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

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