Remove compat stuff

compat/Documentation/Haddock.hs

-{-# LANGUAGE PackageImports #-}
-module Documentation.Haddock {-# DEPRECATED "Use @Documentation.Haddock@ from package <http://hackage.haskell.org/package/haddock-api haddock-api> instead!" #-} (
-  module Documentation.Haddock
-) where
-import "haddock-api" Documentation.Haddock

haddock.cabal

@@ -40,21 +40,6 @@ flag in-ghc-tree
   default: False
   manual: True
 
--- This package re-exports the haddock-api library for compatibility.
--- The library section will be removed in version 2.16.0.
-library
-  exposed: False
-  default-language: Haskell2010
-  hs-source-dirs: compat
-  ghc-options: -Wall
-  build-depends:
-      -- NOTE: Don't bump base dependency!  Remove library section instead!
-      base >= 4.3 && < 4.8
-    , haddock-api
-  exposed-modules: Documentation.Haddock
-  if flag(in-ghc-tree)
-    buildable: False
-
 executable haddock
   default-language:     Haskell2010
   main-is:              Main.hs