Revert "remove old fail compatibility imports that are obsolete ?"

They are needed with ghc <8.4, not for fail but for <> I think.
Try cleaning up again another time.
This reverts commit 318ce7eb07.

hledger-lib/Hledger/Data/Dates.hs

@@ -75,6 +75,8 @@ module Hledger.Data.Dates (
 )
 where
 
+import Prelude ()
+import "base-compat-batteries" Prelude.Compat hiding (fail)
 import qualified "base-compat-batteries" Control.Monad.Fail.Compat as Fail (MonadFail, fail)
 import Control.Applicative.Permutations
 import Control.Monad (unless)

hledger-lib/Hledger/Read/Common.hs

@@ -100,6 +100,8 @@ module Hledger.Read.Common (
 )
 where
 --- * imports
+import Prelude ()
+import "base-compat-batteries" Prelude.Compat hiding (fail, readFile)
 import qualified "base-compat-batteries" Control.Monad.Fail.Compat as Fail (fail)
 import Control.Monad.Except (ExceptT(..), runExceptT, throwError)
 import Control.Monad.State.Strict hiding (fail)

hledger-lib/Hledger/Read/CsvReader.hs

@@ -30,6 +30,8 @@ module Hledger.Read.CsvReader (
   tests_CsvReader,
 )
 where
+import Prelude ()
+import "base-compat-batteries" Prelude.Compat hiding (fail)
 import qualified "base-compat-batteries" Control.Monad.Fail.Compat as Fail (fail)
 import Control.Exception          (IOException, handle, throw)
 import Control.Monad              (liftM, unless, when)

hledger-lib/Hledger/Read/JournalReader.hs

@@ -63,6 +63,8 @@ module Hledger.Read.JournalReader (
 )
 where
 --- * imports
+-- import qualified Prelude (fail)
+-- import "base-compat-batteries" Prelude.Compat hiding (fail, readFile)
 import qualified "base-compat-batteries" Control.Monad.Fail.Compat as Fail (fail)
 import qualified Control.Exception as C
 import Control.Monad (forM_, when, void)

hledger/Hledger/Cli/Commands/Add.hs

@@ -15,6 +15,8 @@ module Hledger.Cli.Commands.Add (
 )
 where
 
+import Prelude ()
+import "base-compat-batteries" Prelude.Compat hiding (fail)
 import Control.Exception as E
 import Control.Monad (when)
 import Control.Monad.Trans.Class