now imports Nix expression of specific version.
* pkgs/development/tools/parsing/sdf/sdf2-bundle-2.2.nix: added
previous version of sdf2-bundle.
* pkgs/development/tools/parsing/sdf2: obsolete.
* pkgs/development/compilers/strategoxt/strategoxt-0.12.nix: use
sdf2-bundle instead of attribute set for the individual packages.
*
svn path=/nixpkgs/trunk/; revision=3081
