iproute2: Update to 5.12.0

iproute2: Update to 5.12.0

- Update from 5.11.0 to 5.12.0
- Update rootfile
- Changelog
   No Changelog in the source tarball or in the git repository
   Changes taken from the git commits from 5.11.0 to 5.12.0
    remove trailing whitespace	Stephen Hemminger
    lib: bpf_legacy: fix missing socket close when connect() fails	Andrea Claudi
    lib: bpf_legacy: treat 0 as a valid file descriptor	Andrea Claudi
    tc: e_bpf: fix memory leak in parse_bpf()	Andrea Claudi
    ip: netns: fix missing netns close on some error paths	Andrea Claudi
    uapi: add missing virtio related headers	Stephen Hemminger
    rdma: stat: fix return code	Andrea Claudi
    rdma: stat: initialize ret in stat_qp_show_parse_cb()	Andrea Claudi
    nexthop: fix memory leak in add_nh_group_attr()	Andrea Claudi
    q_cake: remove useless check on argv	Andrea Claudi
    devlink: always check strslashrsplit() return value	Andrea Claudi
    uapi: update can.h	Stephen Hemminger
    erspan: fix JSON output	Stephen Hemminger
    uapi: bpf.h update from upstream	Stephen Hemminger
    ip: Fix batch processing	Petr Machata
    uapi: minor header update for l2tp	Stephen Hemminger
    README: remove doc instructions	Stephen Hemminger
    ip: cleanup help message text	Stephen Hemminger
    lib/bpf: add missing limits.h includes	Tony Ambardar
    ip: xfrm: limit the length of the security context name when printing	Sabrina Dubroca
    q_cake: Fix incorrect printing of signed values in class statistics	Toke Høiland-Jørgensen
    dcb: Fix compilation warning about reallocarray	Roi Dayan
    iproute: fix printing resolved localhost	Luca Boccassi
    vdpa: add .gitignore	Stephen Hemminger

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>