mjit.c: try changing the order of includes

Hoping to fix the AIX's build failure like:

In file included from ./include/ruby/defines.h:139:0,
                 from ./include/ruby/ruby.h:29,
                 from ./include/ruby.h:33,
                 from internal.h:15,
                 from mjit.c:81:
/opt/freeware/lib/gcc/powerpc-ibm-aix7.1.0.0/4.8.1/include-fixed/unistd.h:939:14: error: conflicting types for 'ftruncate64'
  extern int  ftruncate64(int, off64_t);
              ^
In file included from ./include/ruby/defines.h:139:0,
                 from ./include/ruby/ruby.h:29,
                 from ./include/ruby.h:33,
                 from internal.h:15,
                 from mjit.c:81:
/opt/freeware/lib/gcc/powerpc-ibm-aix7.1.0.0/4.8.1/include-fixed/unistd.h:937:14: note: previous declaration of 'ftruncate64' was here
  extern int  ftruncate(int, off_t);
              ^

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62227 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

mjit.c

@@ -73,6 +73,15 @@
 #define __EXTENSIONS__ 1
 #endif
 
+#include "internal.h"
+#include "vm_core.h"
+#include "mjit.h"
+#include "version.h"
+#include "gc.h"
+#include "constant.h"
+#include "id_table.h"
+#include "ruby_assert.h"
+
 #ifdef _WIN32
 #include <winsock2.h>
 #include <windows.h>
@@ -82,14 +91,6 @@
 #include <dlfcn.h>
 #endif
 
-#include "vm_core.h"
-#include "mjit.h"
-#include "version.h"
-#include "gc.h"
-#include "constant.h"
-#include "id_table.h"
-#include "ruby_assert.h"
-
 extern void rb_native_mutex_lock(rb_nativethread_lock_t *lock);
 extern void rb_native_mutex_unlock(rb_nativethread_lock_t *lock);
 extern void rb_native_mutex_initialize(rb_nativethread_lock_t *lock);