sync: latest libbpf changes from kernel

Syncing latest libbpf commits from kernel repository.
Baseline bpf-next commit:   44bab87d8ca6f0544a9f8fc97bdf33aa5b3c899e
Checkpoint bpf-next commit: e80f2a0d194605553315de68284fc41969f81f62
Baseline bpf commit:        d6d86830705f173fca6087a3e67ceaf68db80523
Checkpoint bpf commit:      343e53754b21ae45530623222aa079fecd3cf942

Christy Lee (2):
  libbpf: Rename bpf_prog_attach_xattr() to bpf_prog_attach_opts()
  libbpf: Deprecate bpf_map__def() API

Coco Li (1):
  gro: add ability to control gro max packet size

Mauricio Vásquez (1):
  libbpf: Use IS_ERR_OR_NULL() in hashmap__free()

Yafang Shao (1):
  libbpf: Fix possible NULL pointer dereference when destroying skeleton

 include/uapi/linux/if_link.h | 1 +
 src/bpf.c                    | 9 +++++++--
 src/bpf.h                    | 4 ++++
 src/hashmap.c                | 3 +--
 src/libbpf.c                 | 3 +++
 src/libbpf.h                 | 3 ++-
 src/libbpf.map               | 1 +
 7 files changed, 19 insertions(+), 5 deletions(-)

--
2.30.2

BPF-CHECKPOINT-COMMIT

@@ -1 +1 @@
-d6d86830705f173fca6087a3e67ceaf68db80523
+343e53754b21ae45530623222aa079fecd3cf942

CHECKPOINT-COMMIT

@@ -1 +1 @@
-44bab87d8ca6f0544a9f8fc97bdf33aa5b3c899e
+e80f2a0d194605553315de68284fc41969f81f62