Patch 2.7.6 and deep-directories failed test

[Sam James]

Your config.log shows -DNDEBUG, which means this is the same as
https://lists.gnu.org/archive/html/bug-patch/2025-02/msg00002.html, and
is fixed by 86ac7e2d7b19e2fd9aab58a8cbeeebd5c6343e5c on master.