Bypassing windows build path on windows32

main.scons

 #! -*- python -*-
 #
 # Copyright (c) 2011 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.
 
 """ Main scons script for Native Client SDK builds.
 
 Do not invoke this script directly, but instead use the scons or scons.bat
 wrapper function.  E.g.
@@ skipping 83 matching lines @@
     CPPDEFINES = [
       'BOOST_ALL_NO_LIB',
     ],
     NACL_TOOLCHAIN_ROOTS = {
         ('x86', 'newlib'):
           build_utils.NormalizeToolchain(arch='x86', variant='newlib'),
         ('x86', 'glibc'):
           build_utils.NormalizeToolchain(arch='x86', variant='glibc'),
     },
     ROOT_DIR = os.path.abspath(os.getcwd()),
-    IS_WINDOWS = sys.platform in ['cygwin', 'win32'],
+    IS_WINDOWS = (sys.platform in ['cygwin', 'win32'] and 
+                  '64' in os.environ.get('PROCESSOR_ARCHITECTURE', '') or
+                  '64' in os.environ.get('PROCESSOR_ARCHITEW6432', '')),
     IS_LINUX = sys.platform == 'linux2',
     IS_MAC = sys.platform == 'darwin',
     JOB_COUNT = GetOption('num_jobs')
 )
 
 # It is possible to override these values on the command line by typing
 # something like this:
 #   PYTHON=/path/to/my/python
 base_env.SetDefault(
     PYTHON = ARGUMENTS.get('PYTHON', 'python'),
@@ skipping 940 matching lines @@
 
 build_env.AddMethod(TestVSSolution)
 
 
 # ----------------------------------------------------------------------------
 BuildComponents(environment_list)
 
 # Require specifying an explicit target only when not cleaning
 if not GetOption('clean'):
   Default(None)