tests: Inline a sysconf call for linuxCPUStatsToBuf
tests: Inline a sysconf call for linuxCPUStatsToBuf

While unlikely, sysconf(_SC_CLK_TCK) could fail leading to
indeterminate results for the subsequent division. So let's
just remove the # define and inline the same change.

Signed-off-by: John Ferlan <87558058f6f829e5ec976c8ef960720af4ff9c7d@redhat.com>
ACKed-by: Michal Privoznik <83d82aaba2eed257f4814b0c239c260c4caaadf0@redhat.com>

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