Fix the timeout program following the changes to base

testsuite/timeout/timeout.hs

 {-# OPTIONS -cpp #-}
 module Main where
 
-import Prelude hiding (catch)
-
 import Control.Concurrent (forkIO, threadDelay)
 import Control.Concurrent.MVar (putMVar, takeMVar, newEmptyMVar)
 import Control.Monad