Non-SFI mode: Add Linux asynchronous signal support

SConstruct

 #! -*- python -*-
 # Copyright (c) 2012 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.
 
 import atexit
 import json
 import os
 import platform
 import re
@@ skipping 696 matching lines @@
     'run_random_test',
     'run_rlimit_test',
     'run_sigaction_test',
     'run_signal_sigbus_test',
     'run_signal_test',
     'run_socket_test',
     'run_stack_alignment_asm_test',
     'run_stack_alignment_test',
     'run_syscall_test',
     'run_thread_test',
+    'run_user_async_signal_test',
     ])
 
 
 # If a test is not in one of these suites, it will probally not be run on a
 # regular basis.  These are the suites that will be run by the try bot or that
 # a large number of users may run by hand.
 MAJOR_TEST_SUITES = set([
   'small_tests',
   'medium_tests',
   'large_tests',
@@ skipping 3311 matching lines @@
   nacl_env.ValidateSdk()
 
 if BROKEN_TEST_COUNT > 0:
   msg = "There are %d broken tests." % BROKEN_TEST_COUNT
   if GetOption('brief_comstr'):
     msg += " Add --verbose to the command line for more information."
   print msg
 
 # separate warnings from actual build output
 Banner('B U I L D - O U T P U T:')