bug#64819: 30.0.50; condition-wait not interruptible

[Helmut Eller <eller.helmut@gmail.com>]

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When Emacs is blocked in condition-wait, then C-g doesn't seem to work.
E.g. Emacs hangs and pressing C-g has no apparent effect when executing
the attached file with:

  emacs -Q -l deadlock.el -f deadlock

Mabye sys_cond_wait could call pthread_cond_timedwait with a fairly long
timeout, say one second, and repeatedly check if C-g was pressed.


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Important settings:
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