ecj for darwin

svn path=/nixpkgs/trunk/; revision=20311

pkgs/top-level/all-packages.nix

@@ -2743,10 +2743,12 @@ let
     inherit getConfig;
   };
 
-  ecj = import ../development/eclipse/ecj {
+  ecj = makeOverridable (import ../development/eclipse/ecj) {
     inherit fetchurl stdenv unzip ant gcj;
   };
 
+  ecjDarwin = ecj.override { gcj = openjdkDarwin; ant = antDarwin; };
+
   jdtsdk = import ../development/eclipse/jdt-sdk {
     inherit fetchurl stdenv unzip;
   };