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

src/untrusted/nacl/nacl.scons

 # -*- 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('env')
 
 # NACL_GC_WRAP_SYSCALL uses ({...}) syntax.
 env.FilterOut(CCFLAGS=['-pedantic'])
@@ skipping 221 matching lines @@
 
 if env.Bit('nacl_glibc'):
   # For nacl-glibc, the standard interfaces are provided by glibc, so
   # we do not build them here.
   sources = SRCS_NACL_EXTENSIONS
 else:
   sources = (SRCS_NACL_EXTENSIONS +
              SRCS_NEWLIB_SYSCALL +
              SRCS_NEWLIB_STUBS +
              SRCS_NEWLIB_MISC)
-  if env.Bit('target_arm') and not env.Bit('bitcode'):
+  if env.Bit('build_arm') and not env.Bit('bitcode'):
     sources.append('aeabi_read_tp.S')
 
 # Do not make a shared version of libnacl.
 libnacl = env.ComponentLibrary('libnacl', sources)
 
 env.AddLibraryToSdk(libnacl)
 header_install = env.AddHeaderToSdk([
     'nacl_random.h', 'nacl_startup.h', 'nacl_thread.h'])
 env.Requires('libnacl', header_install)
 
@@ skipping 58 matching lines @@
   # single .o file avoids this scenario.
   private_combine = [env.ComponentObject(module, '%s.c' % module)
                      for module in ['gc_hooks_private',
                                     'sys_private']]
   sys_private.append(env.Command('combined_private${OBJSUFFIX}',
                                  private_combine,
                                  '${LD} -relocatable -o ${TARGET} ${SOURCES}'))
 
 if not env.Bit('nonsfi_nacl'):
   env.ComponentLibrary('libnacl_sys_private', sys_private)