perf beauty: Stop using the copy of uapi/linux/prctl.h

Use the system one, nothing used in that file isn't available in the
supported, active distros.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
To: Ian Rogers <irogers@google.com>
Link: https://lore.kernel.org/lkml/20240315204835.748716-3-acme@kernel.org


Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>