Fix build error for MRB_WORD_BOXING

include/mruby/value.h

@@ -215,6 +215,7 @@ enum mrb_vtype {
 
 #if defined(MRB_WORD_BOXING)
 
+#include <limits.h>
 #define MRB_TT_HAS_BASIC  MRB_TT_FLOAT
 
 enum mrb_special_consts {

src/codegen.c

@@ -2409,7 +2409,7 @@ scope_new(mrb_state *mrb, codegen_scope *prev, node *lv)
   p->iseq = (mrb_code*)mrb_malloc(mrb, sizeof(mrb_code)*p->icapa);
 
   p->pcapa = 32;
-  p->irep->pool = (struct mrb_value*)mrb_malloc(mrb, sizeof(struct mrb_value)*p->pcapa);
+  p->irep->pool = (mrb_value*)mrb_malloc(mrb, sizeof(mrb_value)*p->pcapa);
   p->irep->plen = 0;
 
   p->scapa = 256;

src/load.c

@@ -87,7 +87,7 @@ read_irep_record_1(mrb_state *mrb, const uint8_t *bin, uint32_t *len)
     if (SIZE_ERROR_MUL(sizeof(mrb_value), plen)) {
       return NULL;
     }
-    irep->pool = (struct mrb_value*)mrb_malloc(mrb, sizeof(mrb_value) * plen);
+    irep->pool = (mrb_value*)mrb_malloc(mrb, sizeof(mrb_value) * plen);
     if (irep->pool == NULL) {
       return NULL;
     }