grsecurity: fix features.grsecurity

Previously, features.grsecurity wasn't actually set due to a bug in the
grsec builder. We now rely on the generic kernel builder to set features
from kernelPatches.

pkgs/build-support/grsecurity/default.nix

@@ -20,8 +20,7 @@ assert (kernel.version == grsecPatch.kver);
 
 overrideDerivation (kernel.override {
   inherit modDirVersion;
-  kernelPatches = [ { inherit (grsecPatch) name patch; } ] ++ kernelPatches ++ (kernel.kernelPatches or []);
-  features = (kernel.features or {}) // { grsecurity = true; };
+  kernelPatches = [ grsecPatch ] ++ kernelPatches ++ (kernel.kernelPatches or []);
   inherit extraConfig;
   ignoreConfigErrors = true;
 }) (attrs: {

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

@@ -31,6 +31,8 @@ let
       url = "https://raw.githubusercontent.com/slashbeast/grsecurity-scrape/master/${grbranch}/${name}.patch";
       inherit sha256;
     };
+
+    features.grsecurity = true;
   };
 in