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Enum forward declarations aren't allowed as the size can't be implied.
Switch to just using an int. This fixes a clang warning:

  In file included from tools/perf/bench/evlist-open-close.c:13:
  tools/perf/bench/../util/parse-events.h:185:6: error: redeclaration of already-defined enum 'perf_tool_event' is a GNU extension [-Werror,-Wgnu-redeclared-enum]
  enum perf_tool_event;
       ^
  tools/perf/bench/../util/evsel.h:28:6: note: previous definition is here
  enum perf_tool_event {
       ^
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20210915211428.1773567-1-irogers@google.com

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