perf tools: Use linux/ctype.h in more places

There were a few places where we still were using the libc version of
ctype.h, switch to the one in tools/lib/ctype.c that the rest of perf
uses.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/n/tip-wa4nz4kt61eze88eprk20tfd@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/arch/s390/util/header.c

@@ -11,7 +11,7 @@
 #include <unistd.h>
 #include <stdio.h>
 #include <string.h>
-#include <ctype.h>
+#include <linux/ctype.h>
 
 #include "../../util/header.h"
 #include "../../util/util.h"

tools/perf/util/metricgroup.c

@@ -17,7 +17,7 @@
 #include "pmu-events/pmu-events.h"
 #include "strlist.h"
 #include <assert.h>
-#include <ctype.h>
+#include <linux/ctype.h>
 
 struct metric_event *metricgroup__lookup(struct rblist *metric_events,
 					 struct perf_evsel *evsel,

tools/perf/util/time-utils.c

@@ -7,7 +7,7 @@
 #include <errno.h>
 #include <inttypes.h>
 #include <math.h>
-#include <ctype.h>
+#include <linux/ctype.h>
 
 #include "perf.h"
 #include "debug.h"