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/Process.hs

@@ -219,21 +219,7 @@ waitForProcess h = do
 	return r
 
 cleanupProcess :: (Maybe Handle, Maybe Handle, Maybe Handle, ProcessHandle) -> IO () 
-#if MIN_VERSION_process(1,6,4)
 cleanupProcess = Utility.Process.Shim.cleanupProcess
-#else
-cleanupProcess (mb_stdin, mb_stdout, mb_stderr, pid) = do
-	-- Unlike the real cleanupProcess, this does not wait
-	-- for the process to finish in the background, so if
-	-- the process ignores SIGTERM, this can block until the process
-	-- gets around the exiting.
-	terminateProcess pid
-	let void _ = return ()
-	maybe (return ()) (void . tryNonAsync . hClose) mb_stdin
-	maybe (return ()) hClose mb_stdout
-	maybe (return ()) hClose mb_stderr
-	void $ waitForProcess pid
-#endif
 
 {- | Like hGetLine, reads a line from the Handle. Returns Nothing if end of
  - file is reached, or the handle is closed, or if the process has exited