Move ArchiveResult into GHCup.Utils.Tar.Types

So a module that wants to import ArchiveResult doesn't have to worry about CPP.

lib/GHCup/Errors.hs

@@ -21,9 +21,6 @@ module GHCup.Errors where
 
 import           GHCup.Types
 
-#if !defined(TAR)
-import           Codec.Archive
-#endif
 import           Control.Exception.Safe
 import           Data.ByteString                ( ByteString )
 import           Data.CaseInsensitive           ( CI )