sync: latest libbpf changes from kernel

Syncing latest libbpf commits from kernel repository.
Baseline bpf-next commit:   ec5b8c76ab1c6d163762d60cfbedcd27e7527144
Checkpoint bpf-next commit: 2ad6d23f465a4f851e3bcf6d74c315ce7b2c205b
Baseline bpf commit:        e1533b6319ab9c3a97dad314dd88b3783bc41b69
Checkpoint bpf commit:      b408473ea01b2e499d23503e2bf898416da9d7ac

Alan Maguire (1):
  libbpf: Fix license for btf_relocate.c

Andrii Nakryiko (2):
  libbpf: Fix no-args func prototype BTF dumping syntax
  libbpf: Fix bpf_object__open_skeleton()'s mishandling of options

David Vernet (1):
  libbpf: Don't take direct pointers into BTF data from st_ops

Jordan Rome (1):
  bpf: Add bpf_copy_from_user_str kfunc

Kan Liang (1):
  perf/x86/intel: Support new data source for Lunar Lake

Sam James (1):
  libbpf: Workaround -Wmaybe-uninitialized false positive

Stanislav Fomichev (1):
  selftests/bpf: Add XDP_UMEM_TX_METADATA_LEN to XSK TX metadata test

Tony Ambardar (1):
  libbpf: Ensure new BTF objects inherit input endianness

 include/uapi/linux/bpf.h        |  9 ++++
 include/uapi/linux/if_xdp.h     |  4 ++
 include/uapi/linux/perf_event.h |  6 ++-
 src/btf.c                       |  4 ++
 src/btf_dump.c                  |  8 ++--
 src/btf_relocate.c              |  2 +-
 src/elf.c                       |  3 ++
 src/libbpf.c                    | 75 ++++++++++++++-------------------
 8 files changed, 62 insertions(+), 49 deletions(-)

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>

BPF-CHECKPOINT-COMMIT

@@ -1 +1 @@
-e1533b6319ab9c3a97dad314dd88b3783bc41b69
+b408473ea01b2e499d23503e2bf898416da9d7ac

CHECKPOINT-COMMIT

@@ -1 +1 @@
-ec5b8c76ab1c6d163762d60cfbedcd27e7527144
+2ad6d23f465a4f851e3bcf6d74c315ce7b2c205b