haskell-packages.nix: allow packages to be built with a version of 'Cabal' other than the one shipped with the compiler

svn path=/nixpkgs/trunk/; revision=32288

pkgs/development/libraries/haskell/Cabal/1.14.0.nix

@@ -0,0 +1,18 @@
+{ cabal, Cabal, filepath }:
+
+cabal.mkDerivation (self: {
+  pname = "Cabal";
+  version = "1.14.0";
+  sha256 = "1r5b4x1ham5gdg9m9l8idpvr9czlk1q21vqmg0di4adkp2fhlm3j";
+  buildDepends = [ Cabal filepath ];
+  meta = {
+    homepage = "http://www.haskell.org/cabal/";
+    description = "A framework for packaging Haskell software";
+    license = self.stdenv.lib.licenses.bsd3;
+    platforms = self.ghc.meta.platforms;
+    maintainers = [
+      self.stdenv.lib.maintainers.andres
+      self.stdenv.lib.maintainers.simons
+    ];
+  };
+})