patch for arbitrary code execution due to heap corruption in `git_index_add`

see: https://github.com/libgit2/libgit2/security/advisories/GHSA-j2v7-4f6v-gpg8
https://security-tracker.debian.org/tracker/CVE-2024-24577

Commit de5e381d broke build of
MariaDB >= 10.5. There were warnings about that with 10.4.

Since openssl 3.0, Config.pm is lauched with shebang "/usr/bin/env perl"
so perl from slapos must be in the PATH.

This is not backward compatible: you'll need to either fix your DB
or disable explicitly.

See !1601

See merge request nexedi/slapos!1558