perf evsel: Remove forward declaration of 'struct perf_evlist'

We have no use for it in evsel.h.
Tested-by: Wang Nan <wangnan0@huawei.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-um03yjrgyi3bj1hzqiqs4dsu@git.kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/evsel.h

@@ -129,7 +129,6 @@ union u64_swap {
 struct cpu_map;
 struct target;
 struct thread_map;
-struct perf_evlist;
 struct record_opts;
 
 static inline struct cpu_map *perf_evsel__cpus(struct perf_evsel *evsel)