[NaCl SDK] nacl_io: Add initial implementations of kill and signal

native_client_sdk/src/libraries/nacl_io/syscalls/ioctl.c

 /* Copyright (c) 2013 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file. */
 
+#include <stdarg.h>
+
 #include "nacl_io/kernel_intercept.h"
 #include "nacl_io/kernel_wrap.h"
 
-int ioctl(int d, int request, char* argp) {
-  return ki_ioctl(d, request, argp);
+int ioctl(int fd, unsigned long request, ...) {
+  va_list ap;
+  va_start(ap, request);
+  char* arg = va_arg(ap, char*);
+  va_end(ap);
+  return ki_ioctl(fd, request, arg);
 }