Updated Haskell packages.

- DSH: updated to version 0.7.8.1
 - alex: updated to versino 3.0.2
 - certificate: updated to version 1.2.2
 - language-c: updated to version 0.4.2
 - xhtml: updated to version 3000.2.1

Also, downgraded GHC 7.4.1 environment to use mtl 2.0 and transformers 2.0 to
avoid lots of build errors, i.e. with monad-par.

svn path=/nixpkgs/trunk/; revision=34042

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

@@ -4,8 +4,8 @@
 
 cabal.mkDerivation (self: {
   pname = "DSH";
-  version = "0.7.8";
-  sha256 = "1mlym2hs7sr78lih8c0yi5y5h14vxy3zpl3gfnidh9wiw5cai9lg";
+  version = "0.7.8.1";
+  sha256 = "1yz8rh3hkqc465slfzi7jqhjd1xrmcghjxl7zprxw082p2qvj8g5";
   buildDepends = [
     convertible csv FerryCore HaXml HDBC json mtl Pathfinder syb text
     xhtml

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

@@ -2,8 +2,8 @@
 
 cabal.mkDerivation (self: {
   pname = "certificate";
-  version = "1.2.1";
-  sha256 = "0lhw38jqkiw7dwckwcqwmsi9br1insb5dp8wajcpgas6xn6cy2qy";
+  version = "1.2.2";
+  sha256 = "0qwx0y534fa5p2wzxd5q2bvcsvmmvmy45rwzj01g6zyjzmx2rnsb";
   isLibrary = true;
   isExecutable = true;
   buildDepends = [ asn1Data cryptoPubkeyTypes mtl pem time ];

pkgs/development/libraries/haskell/language-c/default.nix

@@ -2,8 +2,8 @@
 
 cabal.mkDerivation (self: {
   pname = "language-c";
-  version = "0.3.2.1";
-  sha256 = "1qk86p88p2jk1cbgl8p5g19ip3nh6z22ddj5jac58r5ny076iimx";
+  version = "0.4.2";
+  sha256 = "07pf4v4n7kvr5inkhs24b7g55pmkk4k5ihi6s5dbc200l01wz133";
   buildDepends = [ filepath syb ];
   buildTools = [ alex happy ];
   meta = {

pkgs/development/libraries/haskell/xhtml/3000.2.1.nix

@@ -2,8 +2,8 @@
 
 cabal.mkDerivation (self: {
   pname = "xhtml";
-  version = "3000.2.0.5";
-  sha256 = "1gqq910pncqppb2dscxnfxvm1ly4qpb5mwmady2i4irar3gngh9v";
+  version = "3000.2.1";
+  sha256 = "17qzc6kyiilhi8s25k68fbpyplihb1qxkpc6l93bvjrcchilsf22";
   meta = {
     homepage = "https://github.com/haskell/xhtml";
     description = "An XHTML combinator library";