sync: latest libbpf changes from kernel

Syncing latest libbpf commits from kernel repository.
Baseline bpf-next commit:   4a4b84ba9e453295c746d81cb245c0c5d80050f0
Checkpoint bpf-next commit: 07ee18a0bc946b6b407942c88faed089e20f47d1
Baseline bpf commit:        a766cfbbeb3a
Checkpoint bpf commit:      e34a79b96ab9d49ed8b605fee11099cf3efbb428

Adin Scannell (1):
  libbpf: Fix possible use-after-free for externs

Yuan Chen (1):
  libbpf: Fix null pointer dereference in btf_dump__free on allocation
    failure

 src/btf_dump.c |  3 +++
 src/libbpf.c   | 10 +++++++---
 2 files changed, 10 insertions(+), 3 deletions(-)

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

BPF-CHECKPOINT-COMMIT

@@ -1 +1 @@
-d60d09eadb7cb17690c847f1623436cd4b58c19c
+e34a79b96ab9d49ed8b605fee11099cf3efbb428

CHECKPOINT-COMMIT

@@ -1 +1 @@
-4a4b84ba9e453295c746d81cb245c0c5d80050f0
+07ee18a0bc946b6b407942c88faed089e20f47d1