haskell-graphviz: updated to version 2999.12.0.2

This update obsoletes the requirement for polyparse 1.4, which has
subsequently been removed from the repository.

svn path=/nixpkgs/trunk/; revision=28629

pkgs/development/libraries/haskell/polyparse/1.4.nix

@@ -1,17 +0,0 @@
-{ cabal }:
-
-cabal.mkDerivation (self: {
-  pname = "polyparse";
-  version = "1.4";
-  sha256 = "6e599fb0771e8ce2e1d3a3bbe5eddc2d77b2b4bbb54602f01005dc55dc039d44";
-  meta = {
-    homepage = "http://www.cs.york.ac.uk/fp/polyparse/";
-    description = "A variety of alternative parser combinator libraries";
-    license = "LGPL";
-    platforms = self.ghc.meta.platforms;
-    maintainers = [
-      self.stdenv.lib.maintainers.andres
-      self.stdenv.lib.maintainers.simons
-    ];
-  };
-})