Cleanup: Use Bit('build_ARCH') instead of Bit('target_ARCH')

src/untrusted/valgrind/nacl.scons

 # -*- python -*-
 # Copyright 2010 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.
 
 # See http://code.google.com/p/nativeclient/wiki/ValgrindMemcheck
 # for details.
 
 Import('env')
 
 # we do not have proper arm support and definitely no bitcode support
 # BUG= http://code.google.com/p/nativeclient/issues/detail?id=2357
-if env.Bit('target_arm') or env.Bit('bitcode'):
+if env.Bit('build_arm') or env.Bit('bitcode'):
   Return()
 
 libvalgrind = env.NaClSdkLibrary('libvalgrind', 'valgrind_interceptors.c')
 env.AddHeaderToSdk(['dynamic_annotations.h'])
 
 # With newlib, dynamic annotations are built into libpthread.
 # With glibc, they are in a separate library.
 if env.Bit('nacl_glibc'):
   libdynamic_annotations = env.NaClSdkLibrary('libdynamic_annotations',
                                               'dynamic_annotations.c')