remove superfluous includes

- reduce compile time by a little bit (full-core: ~0.7s for me)
- thanks to 'include-what-you-use' for some help
- include Standard C header files before any other (coding style)

1 files changed, 0 insertions, 2 deletions

diff --git a/src/vm.c b/src/vm.c
index 69f01fe1e..a12763b33 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -4,7 +4,6 @@
 ** See Copyright Notice in mruby.h
 */
 
-#include <string.h>
 #include <setjmp.h>
 #include <stddef.h>
 #include <stdarg.h>
@@ -13,7 +12,6 @@
 #include "mruby/class.h"
 #include "mruby/hash.h"
 #include "mruby/irep.h"
-#include "mruby/numeric.h"
 #include "mruby/proc.h"
 #include "mruby/range.h"
 #include "mruby/string.h"