[NaCl SDK] Fix the AppEngine lua build after r243629.

native_client_sdk/src/tools/tests/nacl_config_test.py

Index: native_client_sdk/src/tools/tests/nacl_config_test.py
diff --git a/native_client_sdk/src/tools/tests/nacl_config_test.py b/native_client_sdk/src/tools/tests/nacl_config_test.py
index c4e9919507797c91fedd1d62a0f6ce7c887228c5..31957c59aeb97ba4b6a283ce2a523810a78fc4ba 100755
--- a/native_client_sdk/src/tools/tests/nacl_config_test.py
+++ b/native_client_sdk/src/tools/tests/nacl_config_test.py
@@ -87,6 +87,8 @@ class TestNaclConfig(unittest.TestCase):
             '/sdk_root/toolchain/mac_x86_glibc/bin/x86_64-nacl-%s' % nacl_tool,
 
         'pnacl': '/sdk_root/toolchain/mac_pnacl/bin/pnacl-%s' % pnacl_tool,
+        ('pnacl', 'pnacl'):
+            '/sdk_root/toolchain/mac_pnacl/bin/pnacl-%s' % pnacl_tool,
     }
 
     for tc_arch, expected in cases.iteritems():
@@ -102,6 +104,12 @@ class TestNaclConfig(unittest.TestCase):
       self.assertRaises(nacl_config.Error,
                         nacl_config.GetToolPath, toolchain, None, tool)
 
+    # Using toolchain=pnacl with any arch other than None, or 'pnacl' is an
+    # error.
+    for arch in ('x86_32', 'x86_64', 'arm', 'foobar'):
+      self.assertRaises(nacl_config.Error,
+                        nacl_config.GetToolPath, toolchain, arch, tool)
+
     # No arm glibc.
     self.assertRaises(nacl_config.Error,
                       nacl_config.GetToolPath, 'glibc', 'arm', tool)