copy an import list from #9551

because `System.Process.Internals` just (like, within the past
hour or so) started exporting a name we are using.

Author: geekosaur

cabal-testsuite/src/Test/Cabal/Server.hs

@@ -40,6 +40,9 @@ import qualified GHC.IO.Exception as GHC
 import Distribution.Verbosity
 
 import System.Process.Internals
+  ( ProcessHandle__( OpenHandle )
+  , withProcessHandle
+  )
 #if mingw32_HOST_OS
 import qualified System.Win32.Process as Win32
 #endif