[NaCl SDK] nacl_io: Enable isatty running under sel_ldr.

native_client_sdk/src/libraries/nacl_io/node.h

Index: native_client_sdk/src/libraries/nacl_io/node.h
diff --git a/native_client_sdk/src/libraries/nacl_io/node.h b/native_client_sdk/src/libraries/nacl_io/node.h
index 54b513a1795e28d35285a5407e14a9ce301f0874..4e4420c0ed6a4820a50fff3654e6e6a89abcdef6 100644
--- a/native_client_sdk/src/libraries/nacl_io/node.h
+++ b/native_client_sdk/src/libraries/nacl_io/node.h
@@ -95,10 +95,12 @@ class Node : public sdk_util::RefObject {
   virtual void SetType(int type);
   // Assume that |out_size| is non-NULL.
   virtual Error GetSize(size_t* out_size);
+  // Returns 0 if node is a TTY
+  virtual Error Isatty();
+
   virtual bool IsaDir();
   virtual bool IsaFile();
   virtual bool IsaSock();
-  virtual bool IsaTTY();
 
   // Number of children for this node (directory)
   virtual int ChildCount();