sync: latest libbpf changes from kernel

Syncing latest libbpf commits from kernel repository.
Baseline bpf-next commit:   c1cccec9c63637c4c5ee0aa2da2850d983c19e88
Checkpoint bpf-next commit: f18ba26da88a89db9b50cb4ff47fadb159f2810b
Baseline bpf commit:        c9a7c013569d73881199a7a3011c03336f592cc8
Checkpoint bpf commit:      d0c0fe10ce6d87734b65c18dc8f4bcae3f4dbea4

Andrii Nakryiko (1):
  libbpf: Reject static entry-point BPF programs

Kumar Kartikeya Dwivedi (2):
  libbpf: Add various netlink helpers
  libbpf: Add low level TC-BPF management API

 src/libbpf.c   |   5 +
 src/libbpf.h   |  44 ++++
 src/libbpf.map |   5 +
 src/netlink.c  | 568 +++++++++++++++++++++++++++++++++++++++++--------
 src/nlattr.h   |  48 +++++
 5 files changed, 587 insertions(+), 83 deletions(-)

--
2.30.2

BPF-CHECKPOINT-COMMIT

@@ -1 +1 @@
-c9a7c013569d73881199a7a3011c03336f592cc8
+d0c0fe10ce6d87734b65c18dc8f4bcae3f4dbea4

CHECKPOINT-COMMIT

@@ -1 +1 @@
-c1cccec9c63637c4c5ee0aa2da2850d983c19e88
+f18ba26da88a89db9b50cb4ff47fadb159f2810b