Use mrb_int instead of int

mrbgems/mruby-print/src/print.c

@@ -6,7 +6,7 @@ static void
 printstr(mrb_state *mrb, mrb_value obj)
 {
   char *s;
-  int len;
+  mrb_int len;
 
   if (mrb_string_p(obj)) {
     s = RSTRING_PTR(obj);

mrbgems/mruby-sprintf/src/sprintf.c

@@ -713,7 +713,7 @@ retry:
         str = mrb_obj_as_string(mrb, arg);
         len = RSTRING_LEN(str);
         if (RSTRING(result)->flags & MRB_STR_EMBED) {
-          int tmp_n = len;
+          mrb_int tmp_n = len;
           RSTRING(result)->flags &= ~MRB_STR_EMBED_LEN_MASK;
           RSTRING(result)->flags |= tmp_n << MRB_STR_EMBED_LEN_SHIFT;
         } else {

mrbgems/mruby-struct/src/struct.c

@@ -506,7 +506,7 @@ mrb_value
 mrb_struct_init_copy(mrb_state *mrb, mrb_value copy)
 {
   mrb_value s;
-  int i, len;
+  mrb_int i, len;
 
   mrb_get_args(mrb, "o", &s);