Remove unnecessory stdint.h.

include/mruby/dump.h

@@ -15,7 +15,6 @@ extern "C" {
 #ifdef ENABLE_STDIO
 #include <stdio.h>
 #endif
-#include <stdint.h>
 
 #ifdef ENABLE_STDIO
 int mrb_dump_irep(mrb_state*,int,FILE*);

include/mruby/khash.h

@@ -12,7 +12,6 @@ extern "C" {
 #endif
 
 #include "mruby.h"
-#include <stdint.h>
 #include <string.h>
 
 typedef uint32_t khint_t;

src/string.c

@@ -6,7 +6,6 @@
 
 #include "mruby.h"
 
-#include <stdint.h>
 #include <stddef.h>
 #include <string.h>
 #include "mruby/string.h"