Committing on behalf of Shea Levy:

This patch adds a "features.aufs2_1" to the aufs-2.1 patch for Linux
2.6.37 to prevent aufs2_1 and aufs2_1_util from being options for
kernels without an aufs 2.1 patch. There were several Hydra build
failures as a result of attempting to build aufs2.1 against older
kernels.

svn path=/nixpkgs/trunk/; revision=26597

pkgs/os-specific/linux/kernel/patches.nix

@@ -209,6 +209,7 @@ in
       name = "aufs2.1";
       patch = ./aufs2.1-37.patch;
       features.aufsBase = true;
+      features.aufs2_1 = true;
     };
 
   # Increase the timeout on CIFS requests from 15 to 120 seconds to