[NaCl SDK] Get nacl_mounts_tests building.

native_client_sdk/src/libraries/nacl_mounts_test/mount_test.cc

Index: native_client_sdk/src/libraries/nacl_mounts_test/mount_test.cc
diff --git a/native_client_sdk/src/libraries/nacl_mounts_test/mount_test.cc b/native_client_sdk/src/libraries/nacl_mounts_test/mount_test.cc
index c5f253757f24c3219e31cac1411d7669790d117c..f649c2a868ccd1a2b98b568dd6a9ae0b4c5f83f9 100644
--- a/native_client_sdk/src/libraries/nacl_mounts_test/mount_test.cc
+++ b/native_client_sdk/src/libraries/nacl_mounts_test/mount_test.cc
@@ -3,18 +3,16 @@
  * found in the LICENSE file.
  */
 
-#include <dirent.h>
 #include <errno.h>
 #include <fcntl.h>
-#include <unistd.h>
 #include <sys/stat.h>
 
 #include <string>
 
 #include "nacl_mounts/mount.h"
 #include "nacl_mounts/mount_mem.h"
+#include "nacl_mounts/osdirent.h"
 
-#define __STDC__ 1
 #include "gtest/gtest.h"
 
 class MountMock : public MountMem {