perf evlist: Add missing util/event.h header

Needed to get the event_attr_init() and perf_event_paranoid() prototypes
that were being obtained indirectly, by sheer luck.

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

tools/perf/util/evlist.c

@@ -24,6 +24,7 @@
 #include "../perf.h"
 #include "asm/bug.h"
 #include "bpf-event.h"
+#include "util/event.h"
 #include "util/string2.h"
 #include "util/perf_api_probe.h"
 #include "util/evsel_fprintf.h"