haskell-xhtml: drop obsolete versions 3000.2.0.1, 3000.2.0.4, and 3000.2.0.5

pkgs/development/libraries/haskell/xhtml/3000.2.0.1.nix

@@ -1,15 +0,0 @@
-# This file was auto-generated by cabal2nix. Please do NOT edit manually!
-
-{ cabal }:
-
-cabal.mkDerivation (self: {
-  pname = "xhtml";
-  version = "3000.2.0.1";
-  sha256 = "15pcigascajky67v0lhdhn4bv8xq16cvzib05mg4f1ynwr5a9mv0";
-  meta = {
-    description = "An XHTML combinator library";
-    license = self.stdenv.lib.licenses.bsd3;
-    platforms = self.ghc.meta.platforms;
-    hydraPlatforms = self.stdenv.lib.platforms.none;
-  };
-})

pkgs/development/libraries/haskell/xhtml/3000.2.0.4.nix

@@ -1,16 +0,0 @@
-# This file was auto-generated by cabal2nix. Please do NOT edit manually!
-
-{ cabal }:
-
-cabal.mkDerivation (self: {
-  pname = "xhtml";
-  version = "3000.2.0.4";
-  sha256 = "07kqii5dsfdaf46y4k19l9llhzhxssr24jbjpr5i8p1qh7117abw";
-  meta = {
-    homepage = "https://github.com/haskell/xhtml";
-    description = "An XHTML combinator library";
-    license = self.stdenv.lib.licenses.bsd3;
-    platforms = self.ghc.meta.platforms;
-    hydraPlatforms = self.stdenv.lib.platforms.none;
-  };
-})

pkgs/development/libraries/haskell/xhtml/3000.2.0.5.nix

@@ -1,16 +0,0 @@
-# This file was auto-generated by cabal2nix. Please do NOT edit manually!
-
-{ cabal }:
-
-cabal.mkDerivation (self: {
-  pname = "xhtml";
-  version = "3000.2.0.5";
-  sha256 = "1gqq910pncqppb2dscxnfxvm1ly4qpb5mwmady2i4irar3gngh9v";
-  meta = {
-    homepage = "https://github.com/haskell/xhtml";
-    description = "An XHTML combinator library";
-    license = self.stdenv.lib.licenses.bsd3;
-    platforms = self.ghc.meta.platforms;
-    hydraPlatforms = self.stdenv.lib.platforms.none;
-  };
-})