remove unnecessary including of <ctype.h>

Not needed anymore since 85075bef75

mrbgems/mruby-string-ext/src/string.c

@@ -1,4 +1,3 @@
-#include <ctype.h>
 #include <string.h>
 #include "mruby.h"
 #include "mruby/array.h"

mrbgems/mruby-string-utf8/src/string.c

@@ -5,7 +5,6 @@
 #include "mruby/range.h"
 #include "mruby/numeric.h"
 #include "mruby/re.h"
-#include <ctype.h>
 #include <string.h>
 
 static const char utf8len_codepage[256] =

mrbgems/mruby-struct/src/struct.c

@@ -4,7 +4,6 @@
 ** See Copyright Notice in mruby.h
 */
 
-#include <ctype.h>
 #include <string.h>
 #include "mruby.h"
 #include "mruby/array.h"

src/class.c

@@ -4,7 +4,6 @@
 ** See Copyright Notice in mruby.h
 */
 
-#include <ctype.h>
 #include <stdarg.h>
 #include "mruby.h"
 #include "mruby/array.h"

src/dump.c

@@ -4,7 +4,6 @@
 ** See Copyright Notice in mruby.h
 */
 
-#include <ctype.h>
 #include <string.h>
 #include <limits.h>
 #include "mruby/dump.h"

src/string.c

@@ -4,7 +4,6 @@
 ** See Copyright Notice in mruby.h
 */
 
-#include <ctype.h>
 #include <float.h>
 #include <limits.h>
 #include <stddef.h>

src/symbol.c

@@ -4,7 +4,6 @@
 ** See Copyright Notice in mruby.h
 */
 
-#include <ctype.h>
 #include <limits.h>
 #include <string.h>
 #include "mruby.h"

src/variable.c

@@ -4,7 +4,6 @@
 ** See Copyright Notice in mruby.h
 */
 
-#include <ctype.h>
 #include "mruby.h"
 #include "mruby/array.h"
 #include "mruby/class.h"