temporary hack to get windows build working

Code for terminating processes on Windows is not linking anymore;
made a warning be displayed instead. This breaks restarting the
assistant and git annex assistant --stop.

I hope to see the code added to the Win32 library, where it should fit
better and should avoid whatever problem is making the linker not like it
when included in git-annex. I opened an issue requesting its addition,
here: https://github.com/haskell/win32/issues/91

This commit was sponsored by Thomas Hochstein on Patreon.

CHANGELOG

@@ -1,3 +1,13 @@
+git-annex (6.20171019) UNRELEASED; urgency=medium
+
+  * Windows build fixed, and changed to use stack for more relaiable build
+    environment.
+  * Code for terminating processes on Windows is not linking anymore;
+    made a warning be displayed instead. This breaks restarting the
+    assistant and git annex assistant --stop.
+
+ -- Joey Hess <id@joeyh.name>  Tue, 24 Oct 2017 13:12:52 -0400
+
 git-annex (6.20171018) unstable; urgency=medium
 
   * add: Replace work tree file atomically on systems supporting hard

Utility/WinProcess.hs

@@ -5,24 +5,9 @@
  - License: BSD-2-clause
  -}
 
-{-# LANGUAGE ForeignFunctionInterface #-}
-
 module Utility.WinProcess where
 
 import Utility.PID
 
-import System.Win32.Process
-import Control.Exception (bracket)
-import Control.Monad
-
 terminatePID :: PID -> IO ()
-terminatePID p = bracket 
-	(openProcess pROCESS_TERMINATE False p)
-	(void . c_closeProcess)
-	(\h -> void $ c_TerminateProcess h 1)
-
-foreign import ccall unsafe "windows.h TerminateProcess"
-	c_TerminateProcess :: ProcessHandle -> Int -> IO Int
-
-foreign import ccall unsafe "windows.h CloseHandle"
-	c_closeProcess :: ProcessHandle -> IO Bool
+terminatePID p = warning "terminating processes on windows is not currently working"