remove many old version ifdefs

Drop support for building with ghc older than 8.4.4, and with older
versions of serveral haskell libraries than will be included in Debian 10.

The only remaining version ifdefs in the entire code base are now a couple
for aws!

This commit should only be merged after the Debian 10 release.
And perhaps it will need to wait longer than that; it would make
backporting new versions of  git-annex to Debian 9 (stretch) which
has been actively happening as recently as this year.

This commit was sponsored by Ilya Shlyakhter.

Database/Export.hs

@@ -9,7 +9,6 @@
 {-# LANGUAGE OverloadedStrings, GADTs, FlexibleContexts #-}
 {-# LANGUAGE MultiParamTypeClasses, GeneralizedNewtypeDeriving #-}
 {-# LANGUAGE RankNTypes #-}
-{-# LANGUAGE CPP #-}
 
 module Database.Export (
 	ExportHandle,
@@ -130,11 +129,7 @@ addExportedLocation h k el = queueDb h $ do
 	let edirs = map
 		(\ed -> ExportedDirectory (toSFilePath (fromExportDirectory ed)) ef)
 		(exportDirectories el)
-#if MIN_VERSION_persistent(2,8,1)
 	putMany edirs
-#else
-	mapM_ insertUnique edirs
-#endif
   where
 	ik = toIKey k
 	ef = toSFilePath (fromExportLocation el)