Revert libbpf submodule to latest intentional change
Revert libbpf submodule to latest intentional change

Signed-off-by: Dave Marchevsky <67ad3de0e5a66ce01a47b7ad0c53144a71b1c54a@fb.com>

iovisor/bcc,iovisor/bcc,iovisor/bcc,iovisor/bcc,iovisor/bcc