Matches https://github.com/ilyagr/pijul-clone as of now, might become out of sync

Fixing an "asynchronous race condition" in libpijul, where deleted conflict-solving vertices can be misclassified as alive during patch application

Created by  pmeunier  on July 4, 2021
NUMESMN7JRZSQFKPPZBZKCNJALFM5PX4Y2YUUXXOU2VQHNTNEDPAC
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