build: fix incremental autogen.sh when no AUTHORS is present
Commit 71d12562 tried to fix a problem where rebasing an old branch on top of newer libvirt.git resulted in automake failing because of a missing AUTHORS file. However, while the fix worked for an incremental 'make', it did not work for someone that directly reran './autogen.sh'. Reported by Laine Stump. * autogen.sh (autoreconf): Check for same conditions as cfg.mk. * cfg.mk (_update_required): Add comments. (cherry picked from commit 55dc872b)
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