[Bug bootstrap/103459] Make configury regenerate cleanly with `autoreconf -Wall`

[pietro at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103459

--- Comment #7 from pietro <pietro at gcc dot gnu.org> ---
Re-sent. Here: https://forge.sourceware.org/gcc/gcc-TEST/pulls/170
and here:
https://inbox.sourceware.org/gcc-patches/bmm.hj3vcrqca8.gcc.gcc-TEST.pietro.170.1.0@forge-stage.sourceware.org/