Fix warnings about unused imports

Author: Mitsutoshi Aoe

GUI/App.hs

@@ -8,11 +8,9 @@
 
 module GUI.App (initApp) where
 
--- Imports for GTK
-import qualified Graphics.UI.Gtk as Gtk
-
 -- Mac OS X-specific GTK imports
 #if defined(darwin_HOST_OS)
+import qualified Graphics.UI.Gtk as Gtk
 import qualified Graphics.UI.Gtk.OSX as OSX
 #endif
 

GUI/Main.hs

@@ -7,7 +7,6 @@ import System.Glib.GError (failOnGError)
 
 -- Imports from Haskell library
 import Text.Printf
-import Control.Monad
 #ifndef mingw32_HOST_OS
 import System.Posix
 #endif

GUI/ProgressView.hs

@@ -17,9 +17,6 @@ import qualified Control.Concurrent as Concurrent
 import Control.Exception
 import Data.Typeable
 
-import Prelude hiding (catch)
-
-
 data ProgressView = ProgressView {
     progressWindow :: Gtk.Window,
     progressLabel  :: Gtk.Label,