sync: latest libbpf changes from kernel

Syncing latest libbpf commits from kernel repository.
Baseline bpf-next commit:   2bbc078f812d45b8decb55935dab21199bd21489
Checkpoint bpf-next commit: 1d1a3bcffe360a56fd8cc287ed74d4c3066daf42
Baseline bpf commit:        3c2f450e553ce47fcb0d6141807a8858e3213c9c
Checkpoint bpf commit:      e7a5f1f1cd0008e5ad379270a8657e121eedb669

Alexei Starovoitov (1):
  libbpf: Sanitize global functions

Andrey Ignatov (1):
  bpf: Document BPF_F_QUERY_EFFECTIVE flag

Andrii Nakryiko (3):
  libbpf: Make bpf_map order and indices stable
  selftests/bpf: Ensure bpf_helper_defs.h are taken from selftests dir
  libbpf: Poison kernel-only integer types

Martin KaFai Lau (2):
  bpf: Synch uapi bpf.h to tools/
  bpf: libbpf: Add STRUCT_OPS support

Michal Rostecki (1):
  libbpf: Add probe for large INSN limit

 include/uapi/linux/bpf.h |  26 +-
 include/uapi/linux/btf.h |   6 +
 src/bpf.c                |  13 +-
 src/bpf.h                |   5 +-
 src/bpf_helpers.h        |   2 +-
 src/bpf_prog_linfo.c     |   3 +
 src/btf.c                |   3 +
 src/btf_dump.c           |   3 +
 src/hashmap.c            |   3 +
 src/libbpf.c             | 701 +++++++++++++++++++++++++++++++++++++--
 src/libbpf.h             |   6 +-
 src/libbpf.map           |   4 +
 src/libbpf_errno.c       |   3 +
 src/libbpf_probes.c      |  26 ++
 src/netlink.c            |   3 +
 src/nlattr.c             |   3 +
 src/str_error.c          |   3 +
 src/xsk.c                |   3 +
 18 files changed, 784 insertions(+), 32 deletions(-)

--
2.17.1

BPF-CHECKPOINT-COMMIT

@@ -1 +1 @@
-3c2f450e553ce47fcb0d6141807a8858e3213c9c
+e7a5f1f1cd0008e5ad379270a8657e121eedb669

CHECKPOINT-COMMIT

@@ -1 +1 @@
-2bbc078f812d45b8decb55935dab21199bd21489
+1d1a3bcffe360a56fd8cc287ed74d4c3066daf42