[btcsuite/btcutil] aa9087: coinset: Update for wire.NewMsgTx API change.

[Dave Collins]

  Branch: refs/heads/master
  Home:   https://github.com/btcsuite/btcutil
  Commit: aa9087a7efc961fbd253d4ae9c8b7a318749c273
      
https://github.com/btcsuite/btcutil/commit/aa9087a7efc961fbd253d4ae9c8b7a318749c273
  Author: Dave Collins <da...@conformal.com>
  Date:   2016-10-26 (Wed, 26 Oct 2016)

  Changed paths:
    M coinset/coins.go
    M coinset/coins_test.go

  Log Message:
  -----------
  coinset: Update for wire.NewMsgTx API change.