[gn] Move build to gypfiles

gypfiles/gyp_v8

 #!/usr/bin/env python
 #
 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
@@ skipping 72 matching lines @@
   for arg in args:
     if arg.startswith('-I') and len(arg) > 2:
       specified_includes.add(os.path.realpath(arg[2:]))
 
   result = []
   def AddInclude(path):
     if os.path.realpath(path) not in specified_includes:
       result.append(path)
 
   # Always include standalone.gypi
-  AddInclude(os.path.join(v8_root, 'build', 'standalone.gypi'))
+  AddInclude(os.path.join(v8_root, 'gypfiles', 'standalone.gypi'))
 
   # Optionally add supplemental .gypi files if present.
   supplements = glob.glob(os.path.join(v8_root, '*', 'supplement.gypi'))
   for supplement in supplements:
     AddInclude(supplement)
 
   return result
 
 
 def run_gyp(args):
@@ skipping 68 matching lines @@
 
   gyp_defines = os.environ.get('GYP_DEFINES', '')
 
   # Automatically turn on crosscompile support for platforms that need it.
   if all(('ninja' in gyp_generators,
           'OS=android' in gyp_defines,
           'GYP_CROSSCOMPILE' not in os.environ)):
     os.environ['GYP_CROSSCOMPILE'] = '1'
 
   run_gyp(gyp_args)