Add support for new pnacl native toolchain driver

ports/devenv/tests/devenv_small_test.js

 /*
  * Copyright (c) 2014 The Native Client Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 /* globals TEST_F, chrometest, DevEnvTest */
 
 'use strict';
 
@@ skipping 59 matching lines @@
 // Run a NaCl executable to make sure syscalls are working.
 TEST_F(DevEnvTest, 'testCTests', function() {
   var self = this;
   return Promise.resolve().then(function() {
     return self.checkCommand('geturl ' +
         chrometest.harnessURL('devenv_small_test.zip') +
                               ' devenv_small_test.zip', 0);
   }).then(function() {
     return self.checkCommand('unzip devenv_small_test.zip', 0);
   }).then(function() {
+    var NACL_BOOT_ARCH = self.params["NACL_BOOT_ARCH"];
     return self.checkCommand(
         'LD_LIBRARY_PATH=${PWD}/${PACKAGE_LIB_DIR}:$LD_LIBRARY_PATH ' +
-        './devenv_small_test_${NACL_BOOT_ARCH}', 0);
+        './devenv_small_test_' + NACL_BOOT_ARCH, 0);
   });
 });