add missing imports

Assistant/ThreadedMonad.hs

@@ -13,6 +13,7 @@ import qualified Annex
 import Control.Concurrent
 import Data.Tuple
 import System.Posix.Types
+import System.Posix.Process
 
 {- The Annex state is stored in a MVar, so that threaded actions can access
  - it. -}

Assistant/Threads/TransferWatcher.hs

@@ -17,6 +17,7 @@ import Utility.Types.DirWatcher
 import Annex.BranchState
 
 import Data.Map as M
+import System.Posix.Process
 
 {- This thread watches for changes to the gitAnnexTransferDir,
  - and updates the DaemonStatus's map of ongoing transfers. -}

Utility/Parallel.hs

@@ -9,6 +9,8 @@ module Utility.Parallel where
 
 import Common
 
+import System.Posix.Process
+
 {- Runs an action in parallel with a set of values.
  - Returns the values partitioned into ones with which the action succeeded,
  - and ones with which it failed. -}