linux-yocto/6.18: libpf prepare for new glibc

linux-yocto/6.18: libpf prepare for new glibc

Integrating the following commit(s) to linux-yocto/6.18:

1/1 [
    Author: Mikhail Gavrilov
    Email: mikhail.v.gavrilov@gmail.com
    Subject: libbpf: Fix -Wdiscarded-qualifiers under C23
    Date: Sat, 6 Dec 2025 14:28:25 +0500

    glibc ≥ 2.42 (GCC 15) defaults to -std=gnu23, which promotes
    -Wdiscarded-qualifiers to an error.

    In C23, strstr() and strchr() return "const char *".

    Change variable types to const char * where the pointers are never
    modified (res, sym_sfx, next_path).

    Suggested-by: Florian Weimer <fweimer@redhat.com>
    Suggested-by: Andrii Nakryiko <andrii@kernel.org>
    Signed-off-by: Mikhail Gavrilov <mikhail.v.gavrilov@gmail.com>
Link: https://lore.kernel.org/r/20251206092825.1471385-1-mikhail.v.gavrilov@gmail.com
    Signed-off-by: Alexei Starovoitov <ast@kernel.org>
    Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
]

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>