perf tools: Remove poll.h and wait.h from util.h

Not needed in this header, added to the places that need poll(), wait()
and a few other prototypes.

Link: http://lkml.kernel.org/n/tip-i39c7b6xmo1vwd9wxp6fmkl0@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-kvm.c

@@ -30,6 +30,7 @@
 #include <linux/time64.h>
 #include <errno.h>
 #include <inttypes.h>
+#include <poll.h>
 #include <termios.h>
 #include <semaphore.h>
 #include <signal.h>