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

native_client_sdk/src/tests/nacl_io_test/main.cc

 // 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 <string>
 
 #include "gtest/gtest.h"
 
 #if defined(SEL_LDR)
 
 int main(int argc, char* argv[]) {
+  setenv("TERM", "xterm-256color", 0);
   ::testing::InitGoogleTest(&argc, argv);
   return RUN_ALL_TESTS();
 }
 
 #else
 
 #include "ppapi/cpp/instance.h"
 #include "ppapi/cpp/var.h"
 #include "ppapi_simple/ps_main.h"
 
@@ skipping 35 matching lines @@
   ::testing::UnitTest::GetInstance()->listeners()
       .Append(new GTestEventListener());
   return RUN_ALL_TESTS();
 }
 
 // Register the function to call once the Instance Object is initialized.
 // see: pappi_simple/ps_main.h
 PPAPI_SIMPLE_REGISTER_MAIN(example_main);
 
 #endif