nodePackages_0_5: don't recurseIntoAttrs

Two reasons for this change:

- most of 5.0 packages don't build yet

- node packages are memory intensive and block Hydra evaluation
(Too many heap sections: Increase MAXHINCR or MAX_HEAP_SECTS)

PS: Removing node packages from evaluation goes from 7.5G down to
4.6G for whole nixos release job.

See #3594 and #11865

pkgs/top-level/all-packages.nix

···
   else
     nodejs-4_x;
 
-  nodePackages_5_x = recurseIntoAttrs (callPackage ./node-packages.nix { self = nodePackages_5_x; nodejs = nodejs-5_x; });
+  nodePackages_5_x = callPackage ./node-packages.nix { self = nodePackages_5_x; nodejs = nodejs-5_x; };
 
   nodePackages_4_x = recurseIntoAttrs (callPackage ./node-packages.nix { self = nodePackages_4_x; nodejs = nodejs-4_x; });