From: Eric Wong <e@80x24.org>
Date: Sat, 21 Jan 2023 08:58:19 +0000 (+0000)
Subject: ds: awaitpid: do not clobber entries for reaped processes
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ds: awaitpid: do not clobber entries for reaped processes

We must only write to $AWAIT_PIDS on the initial reap attempt.
While we're at it, avoid triggering an extra wakeup if we're
doing synchronous awaitpid.  This seems to eliminate most
reliance on Qspawn->DESTROY to call Qspawn->finalize.
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