sync: latest libbpf changes from kernel

Syncing latest libbpf commits from kernel repository.
Baseline bpf-next commit:   b41dae061bbd722b9d7fa828f35d22035b218e18
Checkpoint bpf-next commit: 02dc96ef6c25f990452c114c59d75c368a1f4c8f
Baseline bpf commit:        e3439af4a339acd7fddbd6d59b8ecefaac07a611
Checkpoint bpf commit:      1bd63524593b964934a33afd442df16b8f90e2b5

Yonghong Song (1):
  libbpf: handle symbol versioning properly for libbpf.a

 src/libbpf_internal.h | 16 ++++++++++++++++
 src/xsk.c             |  4 ++--
 2 files changed, 18 insertions(+), 2 deletions(-)

--
2.17.1

BPF-CHECKPOINT-COMMIT

@@ -1 +1 @@
-e3439af4a339acd7fddbd6d59b8ecefaac07a611
+1bd63524593b964934a33afd442df16b8f90e2b5

CHECKPOINT-COMMIT

@@ -1 +1 @@
-b41dae061bbd722b9d7fa828f35d22035b218e18
+02dc96ef6c25f990452c114c59d75c368a1f4c8f