Fix warnings when building with the HEAD

utils/genprimopcode/Main.hs

@@ -8,7 +8,6 @@ module Main where
 import Parser
 import Syntax
 
-import Monad
 import Char
 import List
 import System ( getArgs )

utils/ghc-cabal/ghc-cabal.hs

@@ -12,13 +12,11 @@ import Distribution.Simple.Program
 import Distribution.Simple.Utils (defaultPackageDesc, writeFileAtomic)
 import Distribution.Simple.Build (writeAutogenFiles)
 import Distribution.Simple.Register
-import Distribution.Simple.PackageIndex
 import Distribution.Text
 import Distribution.Verbosity
 import qualified Distribution.InstalledPackageInfo as Installed
 import qualified Distribution.Simple.PackageIndex as PackageIndex
 
-import Control.Monad
 import Data.Maybe
 import System.IO
 import System.Directory