Move all system includes in vboot_firmware to sysincludes.h

vboot_firmware/stub/utility_stub.c

 /* Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  *
  * Stub implementations of utility functions which call their linux-specific
  * equivalents.
  */
 
 #define _STUB_IMPLEMENTATION_
 #include "utility.h"
 
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 
 void error(const char *format, ...) {
   va_list ap;
   va_start(ap, format);
   fprintf(stderr, "ERROR: ");
   vfprintf(stderr, format, ap);
   va_end(ap);
   exit(1);
 }
 
@@ skipping 37 matching lines @@
   int match = 0;
   const unsigned char* us1 = s1;
   const unsigned char* us2 = s2;
   while (n--) {
     if (*us1++ != *us2++)
       match = 1;
   }
 
   return match;
 }