build: rerun bootstrap if AUTHORS is missing
Ever since commit 7b21981c started generating AUTHORS, we now have the situation that if you flip between two branches in the same git repository that cross that commit boundary, then 'make' will fail due to automake complaining about AUTHORS not existing. The simplest solution is to realize that if AUTHORS does not exist, then we flipped branches so we will need to rerun bootstrap anyways; and rerunning bootstrap ensures AUTHORS will exist in time. * cfg.mk (_update_required): Also depend on AUTHORS.
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