perf tools: Remove a few more needless includes from util.h

Link: http://lkml.kernel.org/n/tip-sb2zu21d6h42e5qnsrtl6wuu@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/util.h

@@ -10,18 +10,14 @@
 #include <unistd.h>
 #include <stdio.h>
 #include <sys/stat.h>
-#include <sys/statfs.h>
 #include <fcntl.h>
 #include <stdbool.h>
 #include <stddef.h>
 #include <stdlib.h>
 #include <stdarg.h>
 #include <string.h>
-#include <sys/types.h>
-#include <assert.h>
 #include <sys/wait.h>
 #include <poll.h>
-#include <sys/socket.h>
 #include <sys/ioctl.h>
 #include <linux/types.h>