import: Fix failure of cross-device import on Windows.

As well as import, 2 other places ran "mv" manually, so changed them to use
moveFile as well.

Command/Reinject.hs

@@ -50,11 +50,13 @@ perform src dest key = do
 				)
   where
 	-- the file might be on a different filesystem,
-	-- so mv is used rather than simply calling
+	-- so moveFile is used rather than simply calling
 	-- moveToObjectDir; disk space is also
 	-- checked this way.
 	move = getViaTmp key $ \tmp ->
-		liftIO $ boolSystem "mv" [File src, File tmp]
+		liftIO $ catchBoolIO $ do
+			moveFile src tmp
+			return True
 	reject = const $ return "wrong file?"
 
 cleanup :: Key -> CommandCleanup

Command/SetKey.hs

@@ -31,13 +31,14 @@ mkKey = fromMaybe (error "bad key") . file2key
 
 perform :: FilePath -> Key -> CommandPerform
 perform file key = do
-	-- the file might be on a different filesystem, so mv is used
+	-- the file might be on a different filesystem, so moveFile is used
 	-- rather than simply calling moveAnnex; disk space is also
 	-- checked this way.
 	ok <- getViaTmp key $ \dest ->
 		if dest /= file
-			then liftIO $
-				boolSystem "mv" [File file, File dest]
+			then liftIO $ catchBoolIO $ do
+				moveFile file dest
+				return True
 		else return True
 	if ok
 		then next $ cleanup key