On linux-3.10, build in #! script support

Starting with 3.10, #! script handling can be built modularly (or not
at all). By default the nixpkgs builder sets everything modular, but
since our initird init is a #! script this creates a chicken-and-egg
problem on NixOS.

Signed-off-by: Shea Levy <shea@shealevy.com>

pkgs/os-specific/linux/kernel/linux-3.10.nix

@@ -244,6 +244,9 @@ let
       # Easier debug of NFS issues
       SUNRPC_DEBUG y
 
+      # Our initrd init uses shebang scripts, so can't be modular
+      BINFMT_SCRIPT y
+
       ${if kernelPlatform ? kernelExtraConfig then kernelPlatform.kernelExtraConfig else ""}
       ${extraConfig}
     '';