Remove redundant warning suppression in basicTypes/Literal.lhs

compiler/basicTypes/Literal.lhs

@@ -7,13 +7,6 @@
 \begin{code}
 {-# LANGUAGE DeriveDataTypeable #-}
 
-{-# OPTIONS -fno-warn-tabs #-}
--- The above warning supression flag is a temporary kludge.
--- While working on this module you are encouraged to remove it and
--- detab the module (please do the detabbing in a separate patch). See
---     http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#TabsvsSpaces
--- for details
-
 module Literal
         (
         -- * Main data type