remove 3 build flags

* Removed the webapp-secure build flag, rolling it into the webapp build
  flag.
* Removed the quvi and tahoe build flags, which only adds aeson to
  the core dependencies.
* Removed the feed build flag, which only adds feed to the core
  dependencies.

Build flags have cost in both code complexity and also make Setup configure
have to work harder to find a usable set of build flags when some
dependencies are missing.

Annex.hs

@@ -5,7 +5,7 @@
  - Licensed under the GNU GPL version 3 or higher.
  -}
 
-{-# LANGUAGE CPP, GeneralizedNewtypeDeriving, PackageImports, BangPatterns #-}
+{-# LANGUAGE GeneralizedNewtypeDeriving, PackageImports, BangPatterns #-}
 
 module Annex (
 	Annex,
@@ -62,9 +62,7 @@ import Types.LockCache
 import Types.DesktopNotify
 import Types.CleanupActions
 import qualified Database.Keys.Handle as Keys
-#ifdef WITH_QUVI
 import Utility.Quvi (QuviVersion)
-#endif
 import Utility.InodeCache
 import Utility.Url
 
@@ -130,9 +128,7 @@ data AnnexState = AnnexState
 	, errcounter :: Integer
 	, unusedkeys :: Maybe (S.Set Key)
 	, tempurls :: M.Map Key URLString
-#ifdef WITH_QUVI
 	, quviversion :: Maybe QuviVersion
-#endif
 	, existinghooks :: M.Map Git.Hook.Hook Bool
 	, desktopnotify :: DesktopNotify
 	, workers :: [Either AnnexState (Async AnnexState)]
@@ -177,9 +173,7 @@ newState c r = AnnexState
 	, errcounter = 0
 	, unusedkeys = Nothing
 	, tempurls = M.empty
-#ifdef WITH_QUVI
 	, quviversion = Nothing
-#endif
 	, existinghooks = M.empty
 	, desktopnotify = mempty
 	, workers = []