[commit: ghc] master: Fix potential `mingw32_HOST_OS` breakage from eae19112462fe77 (e76fafa)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/ghc

On branch  : master
Link       : http://ghc.haskell.org/trac/ghc/changeset/e76fafaaeec65d2b4a98556561a96f40d81391ab/ghc

>---------------------------------------------------------------

commit e76fafaaeec65d2b4a98556561a96f40d81391ab
Author: Herbert Valerio Riedel <hvr at gnu.org>
Date:   Sat Sep 20 17:37:24 2014 +0200

    Fix potential `mingw32_HOST_OS` breakage from eae19112462fe77


>---------------------------------------------------------------

e76fafaaeec65d2b4a98556561a96f40d81391ab
 libraries/base/Control/Concurrent.hs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libraries/base/Control/Concurrent.hs b/libraries/base/Control/Concurrent.hs
index 9ab209e..eaf1e66 100644
--- a/libraries/base/Control/Concurrent.hs
+++ b/libraries/base/Control/Concurrent.hs
@@ -123,7 +123,7 @@ import Foreign.C.Types
 #ifdef mingw32_HOST_OS
 import Foreign.C
 import System.IO
-import Data.Maybe (Maybe(..))
+import Data.Functor ( void )
 #endif
 
 import Control.Concurrent.MVar