Dropped obsolete Haskell packages.

- convertible-text: deprecated by author
 - failure: obsolete version 0.1.2
 - attempt: obsolete version 0.3.1.1

svn path=/nixpkgs/trunk/; revision=33470

pkgs/development/libraries/haskell/attempt/0.3.1.1.nix

@@ -1,15 +0,0 @@
-{ cabal, failure }:
-
-cabal.mkDerivation (self: {
-  pname = "attempt";
-  version = "0.3.1.1";
-  sha256 = "0yfn8mh7gy6nh689ic6sygf9d7lk44kpj2wahnljl53k6vw7smv5";
-  buildDepends = [ failure ];
-  meta = {
-    homepage = "http://github.com/snoyberg/attempt/tree/master";
-    description = "Concrete data type for handling extensible exceptions as failures";
-    license = self.stdenv.lib.licenses.bsd3;
-    platforms = self.ghc.meta.platforms;
-    maintainers = [ self.stdenv.lib.maintainers.andres ];
-  };
-})

pkgs/development/libraries/haskell/convertible-text/default.nix

@@ -1,17 +0,0 @@
-{ cabal, attempt, text, time }:
-
-cabal.mkDerivation (self: {
-  pname = "convertible-text";
-  version = "0.4.0.2";
-  sha256 = "1wqpl9dms1rsd24d00f18l9sm601nm6kr7h4ig8y70jdzy8w73fz";
-  isLibrary = true;
-  isExecutable = true;
-  buildDepends = [ attempt text time ];
-  meta = {
-    homepage = "http://github.com/snoyberg/convertible/tree/text";
-    description = "Typeclasses and instances for converting between types (deprecated)";
-    license = self.stdenv.lib.licenses.bsd3;
-    platforms = self.ghc.meta.platforms;
-    maintainers = [ self.stdenv.lib.maintainers.andres ];
-  };
-})

pkgs/development/libraries/haskell/failure/0.1.2.nix

@@ -1,14 +0,0 @@
-{ cabal }:
-
-cabal.mkDerivation (self: {
-  pname = "failure";
-  version = "0.1.2";
-  sha256 = "14pwj0zb5kk2wadpddanxv3kr0hzklxhzbprmkh40yn1dbwgdas4";
-  meta = {
-    homepage = "http://www.haskell.org/haskellwiki/Failure";
-    description = "A simple type class for success/failure computations";
-    license = self.stdenv.lib.licenses.bsd3;
-    platforms = self.ghc.meta.platforms;
-    maintainers = [ self.stdenv.lib.maintainers.andres ];
-  };
-})