[btcsuite/btcd] 2c80b4: Update release script to correct btcctl location.

[Dave Collins]

  Branch: refs/heads/master
  Home:   https://github.com/btcsuite/btcd
  Commit: 2c80b4402477551766ac19d605bf696fe68c8aa0
      
https://github.com/btcsuite/btcd/commit/2c80b4402477551766ac19d605bf696fe68c8aa0
  Author: Dave Collins <da...@conformal.com>
  Date:   2015-02-28 (Sat, 28 Feb 2015)

  Changed paths:
    M release/prep_release.sh

  Log Message:
  -----------
  Update release script to correct btcctl location.