haskell-haskeline: drop obsolete version 0.6.4.7

pkgs/development/libraries/haskell/haskeline/0.6.4.7.nix

@@ -1,22 +0,0 @@
-{ cabal, extensibleExceptions, filepath, mtl, terminfo, utf8String
-}:
-
-cabal.mkDerivation (self: {
-  pname = "haskeline";
-  version = "0.6.4.7";
-  sha256 = "18ma4i2i6hx8bhbkh1d7mqzsqbfj0zc2bkv3czjyylizqwhpq6ih";
-  buildDepends = [
-    extensibleExceptions filepath mtl terminfo utf8String
-  ];
-  configureFlags = "-fterminfo";
-  meta = {
-    homepage = "http://trac.haskell.org/haskeline";
-    description = "A command-line interface for user input, written in Haskell";
-    license = self.stdenv.lib.licenses.bsd3;
-    platforms = self.ghc.meta.platforms;
-    maintainers = [
-      self.stdenv.lib.maintainers.andres
-      self.stdenv.lib.maintainers.simons
-    ];
-  };
-})

pkgs/top-level/haskell-packages.nix

@@ -1010,9 +1010,7 @@ let result = let callPackage = x : y : modifyPrio (newScope result.final x y);
 
   hashtables = callPackage ../development/libraries/haskell/hashtables {};
 
-  haskeline_0_6_4_7 = callPackage ../development/libraries/haskell/haskeline/0.6.4.7.nix {};
+  haskeline = callPackage ../development/libraries/haskell/haskeline {};
-  haskeline_0_7_0_3 = callPackage ../development/libraries/haskell/haskeline/0.7.0.3.nix {};
-  haskeline = self.haskeline_0_7_0_3;
 
   haskelineClass = callPackage ../development/libraries/haskell/haskeline-class {};