haskell-hayland: revert new addition

Reverts (one half of) NixOS/nixpkgs#4999, i.e. 55bb7dd1f2. The
package doesn't compile: http://hydra.cryp.to/build/249781/log/raw.
Please re-submit when the issue has been resolved.

pkgs/development/libraries/haskell/hayland/default.nix

@@ -1,25 +0,0 @@
-# This file was auto-generated by cabal2nix. Please do NOT edit manually!
-
-{ cabal, c2hs, dataFlags, time, wayland, xml,
-  mesa
-}:
-
-cabal.mkDerivation (self: {
-  pname = "hayland";
-  version = "0.1.0.1";
-  sha256 = "0dpisbqfsay8lwpfihw5fmpzi2ajc8qshsawbr4r6x8indy4kdy0";
-  isLibrary = true;
-  isExecutable = true;
-  buildDepends = [ c2hs dataFlags time xml ];
-  testDepends = [ xml ];
-  pkgconfigDepends = [
-    wayland
-    mesa
-  ];
-  doCheck = false;
-  meta = {
-    description = "Haskell bindings for the C Wayland library";
-    license = self.stdenv.lib.licenses.mit;
-    platforms = self.ghc.meta.platforms;
-  };
-})

pkgs/top-level/haskell-packages.nix

@@ -1089,8 +1089,6 @@ self : let callPackage = x : y : modifyPrio (newScope self x y); in
 
   HaTeX = callPackage ../development/libraries/haskell/HaTeX {};
 
-  hayland = callPackage ../development/libraries/haskell/hayland {};
-
   hcltest = callPackage ../development/libraries/haskell/hcltest {};
 
   hedis = callPackage ../development/libraries/haskell/hedis {};