perf test: Skip sigtrap test on old kernels

If it runs on an old kernel, perf_event_open would fail because of the
new fields sigtrap and sig_data.  Just skipping the test could miss an
actual bug in the kernel.

Let's check BTF (when we have libbpf) if it has the sigtrap field in the
perf_event_attr.  Otherwise, we can check it with a minimal event config.

Signed-off-by: Namhyung Kim <[email protected]>
Acked-by: Song Liu <[email protected]>
Suggested-by: Arnaldo Carvalho de Melo <[email protected]> # Using BTF to check for the struct members
Cc: Adrian Hunter <[email protected]>
Cc: Ian Rogers <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Marco Elver <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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