Add LANGUAGE pragmas

It seems that GHC 6.6 just enables -fglasgow-exts when it sees any LANGUAGE
pragma, so not all of them were added; this patch adds the rest of them, which
is necessary for xmonad to compile in GHC >=6.7.

Operations.hs

@@ -1,7 +1,7 @@
 {-# OPTIONS_GHC -fno-warn-orphans #-}
-{-# LANGUAGE FlexibleInstances #-}
+{-# OPTIONS_GHC -fglasgow-exts #-} -- For deriving Data/Typeable
+{-# LANGUAGE FlexibleInstances, MultiParamTypeClasses, PatternGuards, TypeSynonymInstances #-}
 
--- \^^ deriving Typeable
 -- --------------------------------------------------------------------------
 -- |
 -- Module      :  Operations.hs

XMonad.hs

@@ -1,4 +1,4 @@
-{-# LANGUAGE FlexibleInstances #-}
+{-# LANGUAGE ExistentialQuantification, FlexibleInstances, GeneralizedNewtypeDeriving, MultiParamTypeClasses #-}
 
 -----------------------------------------------------------------------------
 -- |