Revert "import Data.Time.Clock to build with time-1.9.1"

This reverts commit 7484191.

Not necessary after all.

Author: joeyh

Utility/TimeStamp.hs

@@ -17,7 +17,6 @@ module Utility.TimeStamp (
 import Utility.Data
 
 import Data.Time.Clock.POSIX
-import Data.Time.Clock
 import Data.Time
 import Data.Ratio
 import Control.Applicative