haskell-src-exts: updated to version 1.11.1.nix

The older version, 1.9.6.nix, is still around because Agda won't accept
the latest one.

svn path=/nixpkgs/trunk/; revision=28226

pkgs/development/libraries/haskell/haskell-src-exts/1.11.1.nix

@@ -0,0 +1,15 @@
+{cabal, cpphs, happy} :
+
+cabal.mkDerivation (self : {
+  pname = "haskell-src-exts";
+  version = "1.11.1";
+  sha256 = "1jqf8l81zw7x5ryf8h2n0b2636yhxkfp3j4ndbqw6hc7i5q581m6";
+  propagatedBuildInputs = [ cpphs happy ];
+  meta = {
+    homepage = "http://code.haskell.org/haskell-src-exts";
+    description = "Manipulating Haskell source: abstract syntax, lexer, parser, and pretty-printer";
+    license = self.stdenv.lib.licenses.bsd3;
+    platforms = self.stdenv.lib.platforms.haskellPlatforms;
+    maintainers = [ self.stdenv.lib.maintainers.simons ];
+  };
+})