sync: latest libbpf changes from kernel

Syncing latest libbpf commits from kernel repository.
Baseline bpf-next commit:   226bc6ae6405c46a6e9865835c36a1d45fc0b3bf
Checkpoint bpf-next commit: 4ca13d1002f37c10038ff4ed3cfdc70dbe049d60
Baseline bpf commit:        915efd8a446b74442039d31689d5d863caf82517
Checkpoint bpf commit:      a6f6a95f25803500079513780d11a911ce551d76

Andrii Nakryiko (1):
  libbpf: disassociate section handler on explicit
    bpf_program__set_type() call

Arnaldo Carvalho de Melo (1):
  tools include UAPI: Synchronize linux/fcntl.h with the kernel sources

Eduard Zingerman (1):
  libbpf: Fix double-free when linker processes empty sections

JP Kobryn (1):
  libbpf: Ensure print callback usage is thread-safe

Jakub Kicinski (1):
  ynl: broaden the license even more

Lorenzo Bianconi (1):
  xdp: add xdp_set_features_flag utility routine

 include/uapi/linux/fcntl.h  |  1 +
 include/uapi/linux/netdev.h |  4 +++-
 src/libbpf.c                | 10 +++++++---
 src/libbpf.h                |  2 ++
 src/linker.c                | 14 +++++++++++++-
 5 files changed, 26 insertions(+), 5 deletions(-)

Signed-off-by: Daniel Müller <deso@posteo.net>

BPF-CHECKPOINT-COMMIT

@@ -1 +1 @@
-915efd8a446b74442039d31689d5d863caf82517
+a6f6a95f25803500079513780d11a911ce551d76

CHECKPOINT-COMMIT

@@ -1 +1 @@
-226bc6ae6405c46a6e9865835c36a1d45fc0b3bf
+4ca13d1002f37c10038ff4ed3cfdc70dbe049d60