sync: Pull latest bpftool changes from kernel

Syncing latest bpftool commits from kernel repository.
Baseline bpf-next commit:   c6fb8030b4baa01c850f99fc6da051b1017edc46
Checkpoint bpf-next commit: a1087da9d11e5bcacc706002bc0f84b790881f69
Baseline bpf commit:        d5fb316e2af1d947f0f6c3666e373a54d9f27c6f
Checkpoint bpf commit:      fb86c42a2a5d44e849ddfbc98b8d2f4f40d36ee3

Arnaldo Carvalho de Melo (1):
  tools headers UAPI: Sync linux/const.h with the kernel headers

Jiri Olsa (1):
  bpf: Add support for uprobe multi session attach

Leon Hwang (1):
  bpf, bpftool: Fix incorrect disasm pc

Viktor Malik (1):
  bpftool: Prevent setting duplicate _GNU_SOURCE in Makefile

 include/uapi/linux/bpf.h   |  1 +
 include/uapi/linux/const.h | 17 ++++++++++++++++
 src/Makefile               |  6 +++++-
 src/jit_disasm.c           | 40 +++++++++++++++++++++++++++-----------
 4 files changed, 52 insertions(+), 12 deletions(-)

Signed-off-by: Quentin Monnet <qmo@kernel.org>

BPF-CHECKPOINT-COMMIT

@@ -1 +1 @@
-d5fb316e2af1d947f0f6c3666e373a54d9f27c6f
+fb86c42a2a5d44e849ddfbc98b8d2f4f40d36ee3

CHECKPOINT-COMMIT

@@ -1 +1 @@
-c6fb8030b4baa01c850f99fc6da051b1017edc46
+a1087da9d11e5bcacc706002bc0f84b790881f69