move libevent into base

base/third_party/libevent/event_rpcgen.py

 #!/usr/bin/env python
 #
 # Copyright (c) 2005 Niels Provos <provos@citi.umich.edu>
 # All rights reserved.
 #
 # Generates marshaling code based on libevent.
 
 import sys
 import re
 
@@ skipping 1403 matching lines @@
 
     print >>sys.stderr, '... creating "%s"' % impl_file
     impl_fp = open(impl_file, 'w')
     print >>impl_fp, BodyPreamble(filename)
     for entry in entities:
         entry.PrintCode(impl_fp)
     impl_fp.close()
 
 if __name__ == '__main__':
     main(sys.argv)