[conformal/btcd] a38f93: use fastsha256 in rpcwebsocket.go.

[Dave Collins]

  Branch: refs/heads/master
  Home:   https://github.com/conformal/btcd
  Commit: a38f93bf06beb06952847953b8f8380f56552439
      
https://github.com/conformal/btcd/commit/a38f93bf06beb06952847953b8f8380f56552439
  Author: Dave Collins <da...@conformal.com>
  Date:   2014-05-01 (Thu, 01 May 2014)

  Changed paths:
    M rpcwebsocket.go

  Log Message:
  -----------
  use fastsha256 in rpcwebsocket.go.

While this is not performance critical code, there is no need to import
another package into the final binary.