Each of these examples needs a version that matches the version of
bftrace.

Refer to
    https://github.com/bpftrace/bpftrace/tree/master/tools#versioned-tools
for the supported list of bpftrace versions, and from there links to
the original *.bt files, which have been slightly modified to allow
them to be used with the PCP bpftrace PMDA.
