rejigger imports for clean build with ghc 7.10's AMP changes

The explict import Prelude after import Control.Applicative is a trick
to avoid a warning.

Utility/UserInfo.hs

@@ -13,12 +13,13 @@ module Utility.UserInfo (
 	myUserGecos,
 ) where
 
+import Utility.Env
+
 import System.PosixCompat
 #ifndef mingw32_HOST_OS
 import Control.Applicative
 #endif
-
-import Utility.Env
+import Prelude
 
 {- Current user's home directory.
  -