[NaCl SDK] Remove syscalls wrappers for chmod and unlink.

native_client_sdk/src/libraries/nacl_io/kernel_wrap_bionic.cc

 // Copyright (c) 2012 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 <sys/types.h>  // Include something that will define __BIONIC__.
 
 // The entire file is wrapped in this #if. We do this so this .cc file can be
 // compiled, even on a non-bionic build.
 
 #if defined(__native_client__) && defined(__BIONIC__)
@@ skipping 323 matching lines @@
   if (!assigned) {
     EXPAND_SYMBOL_LIST_OPERATION(ASSIGN_REAL_PTR)
     assigned = true;
   }
 }
 
 #define CHECK_REAL(func) \
   if (!REAL(func))       \
     assign_real_pointers();
 
+#define CHECK_REAL_NOSYS(func)  \
+  CHECK_REAL(func)              \
+  if (!REAL(func))              \
+    return ENOSYS;
+
 // "real" functions, i.e. the unwrapped original functions.
 
 int _real_close(int fd) {
   CHECK_REAL(close);
   return REAL(close)(fd);
 }
 
 void _real_exit(int status) {
   REAL(exit)(status);
 }
@@ skipping 137 matching lines @@
 int _real_truncate(const char* pathname, int64_t len) {
   CHECK_REAL(truncate);
   return REAL(truncate)(pathname, len);
 }
 
 int _real_write(int fd, const void* buf, size_t count, size_t* nwrote) {
   CHECK_REAL(write);
   return REAL(write)(fd, buf, count, nwrote);
 }
 
+int _real_getcwd(char* pathname, size_t len) {
+  CHECK_REAL_NOSYS(getcwd);
+  return REAL(getcwd)(pathname, len);
+}
+
 static bool s_wrapped = false;
+
 void kernel_wrap_init() {
   if (!s_wrapped) {
     assign_real_pointers();
     EXPAND_SYMBOL_LIST_OPERATION(USE_WRAP)
     s_wrapped = true;
   }
 }
 
 void kernel_wrap_uninit() {
   if (s_wrapped) {
     EXPAND_SYMBOL_LIST_OPERATION(USE_REAL)
     s_wrapped = false;
   }
 }
 
 EXTERN_C_END
 
-#endif  // defined(__native_client__) && defined(__GLIBC__)
+#endif  // defined(__native_client__) && defined(__BIONIC__)