sync: latest libbpf changes from kernel

Syncing latest libbpf commits from kernel repository.
Baseline bpf-next commit:   25601e85441dd91cf7973b002f27af4c5b8691ea
Checkpoint bpf-next commit: 8e64c387c942229c551d0f23de4d9993d3a2acb6
Baseline bpf commit:        3f8ad18f8184
Checkpoint bpf commit:      b4432656b36e5cc1d50a1f2dc15357543add530e

Alan Maguire (1):
  libbpf: Add identical pointer detection to btf_dedup_is_equiv()

Anton Protopopov (2):
  bpf: Fix a comment describing bpf_attr
  libbpf: Add likely/unlikely macros and use them in selftests

Carlos Llamas (1):
  libbpf: Fix implicit memfd_create() for bionic

Feng Yang (1):
  libbpf: Fix event name too long error

Ihor Solodrai (1):
  libbpf: Verify section type in btf_find_elf_sections

Jonathan Wiepert (1):
  Use thread-safe function pointer in libbpf_print

Mykyta Yatsenko (1):
  libbpf: Add getters for BTF.ext func and line info

Paul Chaignon (2):
  bpf: Clarify role of BPF_F_RECOMPUTE_CSUM
  bpf: Clarify the meaning of BPF_F_PSEUDO_HDR

Tao Chen (1):
  libbpf: Remove sample_period init in perf_buffer

Viktor Malik (1):
  libbpf: Fix buffer overflow in bpf_object__init_prog

 include/uapi/linux/bpf.h | 18 +++++----
 src/bpf_helpers.h        |  8 ++++
 src/btf.c                | 22 +++++++++++
 src/libbpf.c             | 81 +++++++++++++++++++++-------------------
 src/libbpf.h             |  6 +++
 src/libbpf.map           |  4 ++
 src/libbpf_internal.h    |  9 +++++
 src/linker.c             |  2 +-
 8 files changed, 103 insertions(+), 47 deletions(-)

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

BPF-CHECKPOINT-COMMIT

@@ -1 +1 @@
-0c2623cef4f49e1ef6a908a389eea86130d11057
+b4432656b36e5cc1d50a1f2dc15357543add530e

CHECKPOINT-COMMIT

@@ -1 +1 @@
-25601e85441dd91cf7973b002f27af4c5b8691ea
+8e64c387c942229c551d0f23de4d9993d3a2acb6