[gn] Move build to gypfiles

gypfiles/get_landmines.py

 #!/usr/bin/env python
 # Copyright 2014 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """
 This file emits the list of reasons why a particular build needs to be clobbered
 (or a list of 'landmines').
 """
 
@@ skipping 14 matching lines @@
   print 'Remove build/android.gypi'
   print 'Cleanup after windows ninja switch attempt.'
   print 'Switching to pinned msvs toolchain.'
   print 'Clobbering to hopefully resolve problem with mksnapshot'
   print 'Clobber after ICU roll.'
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main())