perf tools: Remove old baggage that is util/include/linux/ctype.h

It was just including a ../util.h that wasn't even there:

$ cat tools/perf/util/include/linux/../util.h
cat: tools/perf/util/include/linux/../util.h: No such file or directory
$

This would make kallsyms.h get util.h somehow and then files including
it would get util.h defined stuff, a mess, fix it.

Cc: Adrian Hunter <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Link: https://lkml.kernel.org/n/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/lib/symbol/kallsyms.h

···
 #define __TOOLS_KALLSYMS_H_ 1
 
 #include <elf.h>
-#include <linux/ctype.h>
 #include <linux/types.h>
 
 #ifndef KSYM_NAME_LEN

tools/perf/util/include/linux/ctype.h

···
-#include "../util.h"