[NaCl SDK] nacl_io: Remove unneeded glibc syscall entry points.

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);
 }