turn on PackageImports globally

This will make it easier to use the Evil Splicer, when it needs to add
package qualified imports

And there's no real downside.

Utility/Path.hs

@@ -1,4 +1,3 @@
-{-# LANGUAGE PackageImports #-}
 {- path manipulation
  -
  - Copyright 2010-2011 Joey Hess <joey@kitenet.net>

Utility/State.hs

@@ -5,8 +5,6 @@
  - Licensed under the GNU GPL version 3 or higher.
  -}
 
-{-# LANGUAGE PackageImports #-}
-
 module Utility.State where
 
 import "mtl" Control.Monad.State.Strict