Plumbing though mode parameter to open, since fusefs can make use of it.

native_client_sdk/src/libraries/nacl_io/kernel_intercept.h

Index: native_client_sdk/src/libraries/nacl_io/kernel_intercept.h
diff --git a/native_client_sdk/src/libraries/nacl_io/kernel_intercept.h b/native_client_sdk/src/libraries/nacl_io/kernel_intercept.h
index a9ad2909d338526d46bb5311a3f3b94f79307fca..aad268423db0546d4b8acc0fac39e771d8725018 100644
--- a/native_client_sdk/src/libraries/nacl_io/kernel_intercept.h
+++ b/native_client_sdk/src/libraries/nacl_io/kernel_intercept.h
@@ -85,7 +85,7 @@ int ki_mount(const char* source,
              unsigned long mountflags,
              const void* data);
 int ki_umount(const char* path);
-int ki_open(const char* path, int oflag);
+int ki_open(const char* path, int oflag, mode_t mode);
 int ki_pipe(int pipefds[2]);
 ssize_t ki_read(int fd, void* buf, size_t nbyte);
 ssize_t ki_write(int fd, const void* buf, size_t nbyte);