Drop _DEFAULT_SOURCE and _BSD_SOURCE defines

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 2788 matching lines @@
       BUILD_TYPE_DESCRIPTION = 'Linux ${OPTIMIZATION_LEVEL} build',
       tools = ['target_platform_linux'],
       # TODO(bradnelson): this should really be able to live in unix_like_env
       #                   but can't due to what the target_platform_x module is
       #                   doing.
       LINK = '$CXX',
   )
 
   # Prepend so we can disable warnings via Append
   linux_env.Prepend(
-      CPPDEFINES = [['_DEFAULT_SOURCE', '1'],
-                    ['_BSD_SOURCE', '1'],
-                    ['_POSIX_C_SOURCE', '199506'],
+      CPPDEFINES = [['_POSIX_C_SOURCE', '199506'],
                     ['_XOPEN_SOURCE', '600'],
                     ['_GNU_SOURCE', '1'],
                     ['_LARGEFILE64_SOURCE', '1'],
                     ],
       LIBS = ['rt'],
       )
 
   if linux_env.Bit('build_x86_32'):
     linux_env.Prepend(
         CCFLAGS = ['-m32'],
@@ skipping 291 matching lines @@
 
 # These add on to those set in pre_base_env, above.
 nacl_env.Append(
     CPPDEFINES = [
         # This ensures that UINT32_MAX gets defined.
         ['__STDC_LIMIT_MACROS', '1'],
         # This ensures that PRId64 etc. get defined.
         ['__STDC_FORMAT_MACROS', '1'],
         # _GNU_SOURCE ensures that strtof() gets declared.
         ['_GNU_SOURCE', 1],
-        # strdup, and other common stuff
-        ['_DEFAULT_SOURCE', '1'],
-        ['_BSD_SOURCE', '1'],
         ['_POSIX_C_SOURCE', '199506'],
         ['_XOPEN_SOURCE', '600'],
 
         ['DYNAMIC_ANNOTATIONS_ENABLED', '1' ],
         ['DYNAMIC_ANNOTATIONS_PREFIX', 'NACL_' ],
 
         ['NACL_BUILD_ARCH', '${BUILD_ARCHITECTURE}'],
         ['NACL_BUILD_SUBARCH', '${BUILD_SUBARCH}'],
         ],
     )
@@ skipping 910 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:')