[conformal/btcwire] ab8c8e: Add benchmarks for writeTxOut.

[Dave Collins]

  Branch: refs/heads/master
  Home:   https://github.com/conformal/btcwire
  Commit: ab8c8e2d39986d127dff8ec85f46fcea498ead1a
      
https://github.com/conformal/btcwire/commit/ab8c8e2d39986d127dff8ec85f46fcea498ead1a
  Author: Dave Collins <da...@conformal.com>
  Date:   2013-11-06 (Wed, 06 Nov 2013)

  Changed paths:
    M bench_test.go
    M internal_test.go
    M msgtx.go

  Log Message:
  -----------
  Add benchmarks for writeTxOut.

This commit adds a benchmark for the writeTxOut function.