Remove all gyp BUILD rules with multiple outputs.

tools/js2c.py

 #!/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 565 matching lines @@
 
 
 def main():
   parser = optparse.OptionParser()
   parser.add_option("--raw",
                     help="file to write the processed sources array to.")
   parser.add_option("--startup_blob",
                     help="file to write the startup blob to.")
   parser.add_option("--js",
                     help="writes a JS file output instead of a C file",
-                    action="store_true")
+                    action="store_true", default=False, dest='js')
+  parser.add_option("--nojs", action="store_false", default=False, dest='js')
   parser.set_usage("""js2c out.cc type sources.js ...
         out.cc: C code to be generated.
         type: type parameter for NativesCollection template.
         sources.js: JS internal sources or macros.py.""")
   (options, args) = parser.parse_args()
   JS2C(args[2:],
        args[0],
        args[1],
        options.raw,
        options.startup_blob,
        options.js)
 
 
 if __name__ == "__main__":
   main()