eliminate s2w8 and w82s

Note that the use of s2w8 in genUUIDInNameSpace made it truncate unicode
characters. Luckily, genUUIDInNameSpace is only ever used on ASCII
strings as far as I can determine. In particular, git-remote-gcrypt's
gcrypt-id is an ASCII string.

Utility/Data.hs

@@ -10,12 +10,8 @@
 module Utility.Data (
 	firstJust,
 	eitherToMaybe,
-	s2w8,
-	w82s,
 ) where
 
-import Data.Word
-
 {- First item in the list that is not Nothing. -}
 firstJust :: Eq a => [Maybe a] -> Maybe a
 firstJust ms = case dropWhile (== Nothing) ms of
@@ -24,15 +20,3 @@ firstJust ms = case dropWhile (== Nothing) ms of
 
 eitherToMaybe :: Either a b -> Maybe b
 eitherToMaybe = either (const Nothing) Just
-
-c2w8 :: Char -> Word8
-c2w8 = fromIntegral . fromEnum
-
-w82c :: Word8 -> Char
-w82c = toEnum . fromIntegral
-
-s2w8 :: String -> [Word8]
-s2w8 = map c2w8
-
-w82s :: [Word8] -> String
-w82s = map w82c