Switch from using 'nacl_main' to 'main' entry point

PRESUBMIT.py

 # 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.
 
 # Documentation on PRESUBMIT.py can be found at:
 # http://www.chromium.org/developers/how-tos/depottools/presubmit-scripts
 
 import os
 import subprocess
 
 PYTHON = 'build_tools/python_wrapper'
 
 _EXCLUDED_PATHS = (
     # patch_configure.py contains long lines embedded in multi-line
     # strings.
     r"^build_tools[\\\/]patch_configure.py",
     # Many of the files in glibc-compat come from the other sources such as
     # newlib and as such do not contain our copyright header.
     r"^ports[\/\\]glibc-compat[\/\\]include[\/\\]err\.h",
     r"^ports[\/\\]glibc-compat[\/\\]include[\/\\]fts\.h",
     r"^ports[\/\\]glibc-compat[\/\\]src[\/\\]err\.c",
     r"^ports[\/\\]glibc-compat[\/\\]src[\/\\]libc-symbols\.h",
     r"^ports[\/\\]glibc-compat[\/\\]src[\/\\]dirfd.c",
     r"^ports[\/\\]glibc-compat[\/\\]src[\/\\]flock.c",
     r"^ports[\/\\]glibc-compat[\/\\]src[\/\\]fts.c",
     r"^ports[\/\\]glibc-compat[\/\\]src[\/\\]herror.c",
     r"^ports[\/\\]glibc-compat[\/\\]src[\/\\]timegm.c",
+    r"^ports[\\\/]alut-demo[\\\/]alut_hello_world.c",
 )
 
 def RunPylint(input_api, output_api):
   output = []
   canned = input_api.canned_checks
   disabled_warnings = [
     'W0613',  # Unused argument
   ]
   black_list = list(input_api.DEFAULT_BLACK_LIST) + [
     r'ports[\/\\]ipython-ppapi[\/\\]kernel\.py',
@@ skipping 108 matching lines @@
     'naclports-linux-clang-4',
     'naclports-linux-clang-5',
     'naclports-linux-emscripten-0',
 ]
 
 
 def GetPreferredTryMasters(_, change):
   return {
     'tryserver.nacl': { t: set(['defaulttests']) for t in TRYBOTS },
   }