Convert setup.py to use setuptools

pylib/gyp/__init__.py

Index: pylib/gyp/__init__.py
diff --git a/pylib/gyp/__init__.py b/pylib/gyp/__init__.py
index 3b921e63f7904ee67b0e14ac7a6f7d99ad97164d..61ce418723ad252cc8b62fc62f4d0943836efef9 100755
--- a/pylib/gyp/__init__.py
+++ b/pylib/gyp/__init__.py
@@ -542,5 +542,9 @@ def main(args):
     sys.stderr.write("gyp: %s\n" % e)
     return 1
 
+# NOTE: setuptools generated console_scripts calls function with no arguments
+def script_main():
+  return main(sys.argv[1:])
+
 if __name__ == '__main__':
-  sys.exit(main(sys.argv[1:]))
+  sys.exit(script_main())