remove support for building with older Win32

No need to preserve this since the cabal file depends on the newer one.

Utility/LockFile/Windows.hs

@@ -5,7 +5,7 @@
  - License: BSD-2-clause
  -}
 
-{-# LANGUAGE OverloadedStrings, CPP #-}
+{-# LANGUAGE OverloadedStrings #-}
 
 module Utility.LockFile.Windows (
 	lockShared,
@@ -58,21 +58,12 @@ lockExclusive = openLock fILE_SHARE_NONE
 openLock :: ShareMode -> LockFile -> IO (Maybe LockHandle)
 openLock sharemode f = do
 	f' <- convertToWindowsNativeNamespace f
-#if MIN_VERSION_Win32(2,13,4)
 	r <- tryNonAsync $ createFile_NoRetry f' gENERIC_READ sharemode 
 		security_attributes oPEN_ALWAYS fILE_ATTRIBUTE_NORMAL
 		(maybePtr Nothing)
 	return $ case r of
 		Left _ -> Nothing
 		Right h -> Just h
-#else
-	h <- withTString (fromRawFilePath f') $ \c_f ->
-		c_CreateFile c_f gENERIC_READ sharemode security_attributes
-			oPEN_ALWAYS fILE_ATTRIBUTE_NORMAL (maybePtr Nothing)
-	return $ if h == iNVALID_HANDLE_VALUE
-		then Nothing
-		else Just h
-#endif
   where
 	security_attributes = maybePtr Nothing