Disable build of simarm from the -arch=all configuration.

tools/build.py

 #!/usr/bin/env python
 #
 # Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 #
 
 import optparse
 import os
 import shutil
@@ skipping 23 matching lines @@
       metavar=HOST_CPUS,
       default=str(HOST_CPUS))
   result.add_option("--devenv",
       help='Path containing devenv.com on Windows',
       default='C:\\Program Files (x86)\\Microsoft Visual Studio 9.0\\Common7\\IDE')
   return result
 
 
 def ProcessOptions(options):
   if options.arch == 'all':
-    options.arch = 'ia32,x64,simarm'
+    options.arch = 'ia32,x64'
   if options.mode == 'all':
     options.mode = 'release,debug'
   options.mode = options.mode.split(',')
   options.arch = options.arch.split(',')
   for mode in options.mode:
     if not mode in ['debug', 'release']:
       print "Unknown mode %s" % mode
       return False
   for arch in options.arch:
     if not arch in ['ia32', 'x64', 'simarm', 'arm']:
@@ skipping 105 matching lines @@
       process.wait()
       if process.returncode != 0:
         print "BUILD FAILED"
         return 1
 
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(Main())