remove i386ancient and need at least debian stable to build

* Removed the i386ancient standalone tarball build for linux, which
  was increasingly unable to support new git-annex features.
* Removed support for building with ghc older than 9.0.2,
  and with older versions of haskell libraries than are in current Debian
  stable.
* stack.yaml: Update to lts-23.2.

Note that i386ancient was targeting linux 2.6.32, which has been EOL for
over 9 years now. Any old system still using such a kernel is certainly highly
insecure. And I suspect i386ancient had its own insecurities due to haskell
libraries and C libraries not having been updated.

Utility/TList.hs

@@ -12,7 +12,6 @@
  -}
 
 {-# LANGUAGE BangPatterns #-}
-{-# LANGUAGE CPP #-}
 
 module Utility.TList (
 	TList,
@@ -45,11 +44,7 @@ newTList = newEmptyTMVar
 headTList :: TList a -> STM a
 headTList tlist = do
 	dl <- takeTMVar tlist
-#if MIN_VERSION_dlist(1,0,0)
 	let !dl' = D.fromList $ D.tail dl
-#else
-	let !dl' = D.tail dl
-#endif
 	unless (emptyDList dl') $
 		putTMVar tlist dl'
 	return (D.head dl)