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

[cvs-commit at gcc dot gnu.org]

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

--- Comment #12 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The trunk branch has been updated by Pietro Monteiro <pietro@gcc.gnu.org>:

https://gcc.gnu.org/g:16756fcc9f6bd1e8876e7f48fb20e1729a9b3529

commit r17-1851-g16756fcc9f6bd1e8876e7f48fb20e1729a9b3529
Author: Pietro Monteiro <pietro@sociotechnical.xyz>
Date:   Thu Jun 25 08:29:18 2026 -0400

    libstdc++: Update AM_PROG_LIBTOOL to LT_INIT [PR103459]

    AM_PROG_LIBTOOL has been deprecated by libtool. Update to LT_INIT.

            PR bootstrap/103459

    libstdc++-v3/ChangeLog:

            * configure: Regenerate.
            * configure.ac: Update AM_PROG_LIBTOOL to LT_INIT.

    Signed-off-by: Pietro Monteiro <pietro@sociotechnical.xyz>