attempt at a quick, utf-8 only fix to the ghc 7.4 problem

If you have only utf-8 filenames, and need to build git-annex with ghc 7.4,
this will work. But, it will crash on non-utf-8 filenames.

Command/Uninit.hs

@@ -7,7 +7,7 @@
 
 module Command.Uninit where
 
-import qualified Data.ByteString.Lazy.Char8 as B
+import qualified Data.Text.Lazy as L
 
 import Common.Annex
 import Command
@@ -29,7 +29,7 @@ check = do
 	when (b == Annex.Branch.name) $ error $
 		"cannot uninit when the " ++ show b ++ " branch is checked out"
 	where
-		current_branch = Git.Ref . Prelude.head . lines . B.unpack <$> revhead
+		current_branch = Git.Ref . Prelude.head . lines . L.unpack <$> revhead
 		revhead = inRepo $ Git.Command.pipeRead 
 			[Params "rev-parse --abbrev-ref HEAD"]
 

Command/Unused.hs

@@ -10,7 +10,8 @@
 module Command.Unused where
 
 import qualified Data.Set as S
-import qualified Data.ByteString.Lazy.Char8 as L
+import qualified Data.Text.Lazy as L
+import qualified Data.Text.Lazy.Encoding as L
 
 import Common.Annex
 import Command
@@ -202,7 +203,7 @@ getKeysReferencedInGit ref = do
 		findkeys c [] = return c
 		findkeys c (l:ls)
 			| isSymLink (LsTree.mode l) = do
-				content <- catFile ref $ LsTree.file l
+				content <- L.decodeUtf8 <$> catFile ref (LsTree.file l)
 				case fileKey (takeFileName $ L.unpack content) of
 					Nothing -> findkeys c ls
 					Just k -> findkeys (k:c) ls