perf tools: Add CAP_SYSLOG define for older systems

Some of the systems I test don't have that define, provide it
conditionally since we'll use it in the kptr_restrict checks in the next
patch.

Cc: Alexander Shishkin <[email protected]>
Cc: Alexey Budankov <[email protected]>
Cc: Igor Lubashev <[email protected]>
Cc: James Morris <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Mathieu Poirier <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Suzuki Poulouse <[email protected]>
Link: https://lkml.kernel.org/n/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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