cc: libbpf: Fix ambiguous comment
cc: libbpf: Fix ambiguous comment

When creating [k,u]probe, comment above bpf_try_perf_event_open_with_probe()
said "new kernel API".

"new" is a relative concept and it's committed at f180ea1
("bcc: add functions to use new [k,u]probe API"), it's not "new" now.

The "new" API came from
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e12f03d

Remove "new" word and explicit provide which commit in the Linux kernel is.

iovisor/bcc,iovisor/bcc,tuxology/bcc,iovisor/bcc,tuxology/bcc,brendangregg/bcc,tuxology/bcc,tuxology/bcc,brendangregg/bcc,brendangregg/bcc,tuxology/bcc,iovisor/bcc,iovisor/bcc,brendangregg/bcc,brendangregg/bcc