fix-cabal-1.4-build

Hide conflicting imports of Distribution.Package.depends and packageName where necessary to allow hs-plugins to build against Cabal>=1.4.

src/System/Plugins/Env.hs

@@ -74,7 +74,7 @@ import System.IO.Error          ( catch, ioError, isDoesNotExistError )
 
 import Control.Concurrent.MVar  ( MVar(), newMVar, withMVar )
 
-import Distribution.Package
+import Distribution.Package hiding (packageName)
 import Text.ParserCombinators.ReadP
 
 import qualified Data.Map as M