bring back OsPath changes

I hope that the windows test suite failure on appveyor was fixed by
updating to a newer windows there. I have not been able to reproduce
that failure in a windows 11 VM run locally.

Utility/LockFile/Windows.hs

@@ -75,9 +75,9 @@ openLock sharemode f = do
 	return $ if h == iNVALID_HANDLE_VALUE
 		then Nothing
 		else Just h
-#endif
   where
 	security_attributes = maybePtr Nothing
+#endif
 
 dropLock :: LockHandle -> IO ()
 dropLock = closeHandle