Revert pax change as it does not work with older versions of scons.

src/SConscript

 # Copyright 2008 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 280 matching lines @@
 
   source_objs = context.ConfigureObject(env, source_files)
   non_snapshot_files = [dtoa_obj, source_objs]
 
   # Create snapshot if necessary.
   empty_snapshot_obj = context.ConfigureObject(env, 'snapshot-empty.cc')
   mksnapshot_env = env.Copy()
   mksnapshot_env.Replace(**context.flags['mksnapshot'])
   mksnapshot_src = 'mksnapshot.cc'
   mksnapshot = mksnapshot_env.Program('mksnapshot', [mksnapshot_src, libraries_obj, non_snapshot_files, empty_snapshot_obj], PDB='mksnapshot.exe.pdb')
-
-  # Fix build on Linux systems with PaX enabled, see
-  # http://code.google.com/p/v8/issues/detail?id=607. The dash ("-") at the
-  # beginning of the command makes scons ignore the return code, since
-  # /sbin/paxctl may not be present at all systems (especially non-Linux).
-  mksnapshot_env.AddPostAction(mksnapshot, '-/sbin/paxctl -m ${TARGET}')
-
   if context.use_snapshot:
     if context.build_snapshot:
       snapshot_cc = env.Snapshot('snapshot.cc', mksnapshot, LOGFILE=File('snapshot.log').abspath)
     else:
       snapshot_cc = Command('snapshot.cc', [], [])
     snapshot_obj = context.ConfigureObject(env, snapshot_cc, CPPPATH=['.'])
   else:
     snapshot_obj = empty_snapshot_obj
-
   library_objs = [non_snapshot_files, libraries_obj, snapshot_obj]
   return (library_objs, d8_objs, [mksnapshot])
 
 
 (library_objs, d8_objs, mksnapshot) = ConfigureObjectFiles()
 Return('library_objs d8_objs mksnapshot')