[NaCl SDK] nacl_io: remove getcwd() implemenation (rely on glibc/newlib versions)

native_client_sdk/src/libraries/nacl_io/syscalls/getcwd.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 <limits.h>
-#include <string.h>
-
-#include "nacl_io/kernel_intercept.h"
-#include "nacl_io/kernel_wrap.h"
-
-/*
- * This interception should not really be needed under glibc since we can
- * hook the internal calls to getcwd.  However, we need to intercept it here
- * since gtest call getcwd in a static constructor which general runs before
- * nacl_io is initiliased.
- */
-char* getcwd(char* buf, size_t size) {
-  // If size is 0, allocate as much as we need.
-  if (size == 0) {
-    char stack_buf[PATH_MAX + 1];
-    if (!ki_getcwd(stack_buf, PATH_MAX))
-      return NULL;
-    size = strlen(stack_buf) + 1;
-  }
-  // Allocate the buffer if needed
-  if (buf == NULL) {
-    buf = (char*)malloc(size);
-  }
-  return ki_getcwd(buf, size);
-}