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.

Command/ImportFeed.hs

@@ -170,7 +170,7 @@ getFeed o url st =
 
 	-- Use parseFeedFromFile rather than reading the file
 	-- ourselves because it goes out of its way to handle encodings.
-	parse tmpf = liftIO (parseFeedFromFile' tmpf) >>= \case
+	parse tmpf = liftIO (parseFeedFromFile tmpf) >>= \case
 		Nothing -> debugfeedcontent tmpf "parsing the feed failed"
 		Just f -> do
 			case decodeBS $ fromFeedText $ getFeedTitle f of
@@ -201,13 +201,6 @@ getFeed o url st =
 			record (Just (Just (playlistDownloads url playlist)))
 			next $ return True
 
-parseFeedFromFile' :: FilePath -> IO (Maybe Feed)
-#if MIN_VERSION_feed(1,1,0)
-parseFeedFromFile' = parseFeedFromFile
-#else
-parseFeedFromFile' f = catchMaybeIO (parseFeedFromFile f)
-#endif
-
 data ToDownload = ToDownload
 	{ feedurl :: URLString
 	, location :: DownloadLocation