sync: latest libbpf changes from kernel

Syncing latest libbpf commits from kernel repository.
Baseline bpf-next commit:   989a29cfed9b5092c3e18be14e9032c51bb1c9f6
Checkpoint bpf-next commit: c6fb8030b4baa01c850f99fc6da051b1017edc46
Baseline bpf commit:        b836cbdf3b81a4a22b3452186efa2e5105a77e10
Checkpoint bpf commit:      d5fb316e2af1d947f0f6c3666e373a54d9f27c6f

Andrii Nakryiko (1):
  libbpf: move global data mmap()'ing into bpf_object__load()

Eder Zulian (1):
  libbpf: Prevent compiler warnings/errors

Hou Tao (1):
  bpf: Add the missing BPF_LINK_TYPE invocation for sockmap

Kui-Feng Lee (1):
  libbpf: define __uptr.

 include/uapi/linux/bpf.h |  3 ++
 src/bpf_helpers.h        |  1 +
 src/btf_dump.c           |  4 +-
 src/libbpf.c             | 83 +++++++++++++++++++---------------------
 4 files changed, 46 insertions(+), 45 deletions(-)

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

BPF-CHECKPOINT-COMMIT

@@ -1 +1 @@
-b836cbdf3b81a4a22b3452186efa2e5105a77e10
+d5fb316e2af1d947f0f6c3666e373a54d9f27c6f

CHECKPOINT-COMMIT

@@ -1 +1 @@
-989a29cfed9b5092c3e18be14e9032c51bb1c9f6
+c6fb8030b4baa01c850f99fc6da051b1017edc46