perf tools: Remove duplicate headers

Removed headers which are included twice.
Signed-off-by: Souptick Joarder <jrdr.linux@gmail.com>
Reviewed-by: Mukesh Ojha <mojha@codeaurora.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1566663319-4283-1-git-send-email-jrdr.linux@gmail.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/data.c

@@ -9,7 +9,6 @@
 #include <unistd.h>
 #include <string.h>
 #include <asm/bug.h>
-#include <sys/types.h>
 #include <dirent.h>
 
 #include "data.h"

tools/perf/util/get_current_dir_name.c

@@ -5,7 +5,6 @@
 #include "get_current_dir_name.h"
 #include <unistd.h>
 #include <stdlib.h>
-#include <stdlib.h>
 
 /* Android's 'bionic' library, for one, doesn't have this */
 

tools/perf/util/stat-display.c

@@ -14,7 +14,6 @@
 #include "string2.h"
 #include <linux/ctype.h>
 #include "cgroup.h"
-#include <math.h>
 #include <api/fs/fs.h>
 
 #define CNTR_NOT_SUPPORTED	"<not supported>"