m4 1.4.18 - test-canonicalize-lgpl

Building m4 1.4.18 / v3.13 fails for me

FAIL: test-canonicalize-lgpl
============================

test-canonicalize-lgpl.c:199: assertion 'strcmp (result1, "/") == 0' failed
Aborted
FAIL test-canonicalize-lgpl (exit status: 134)

#12295 (closed) seems to be related.

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