lttng-modules: mark as broken on grsec

All hydra builds against grsec kernels fail; seemingly because
the PaX hardening plugins are incompatible with lttng-modules
(the code writes to locations marked as read-only).

pkgs/os-specific/linux/lttng-modules/default.nix

@@ -25,6 +25,7 @@ stdenv.mkDerivation rec {
     license = with licenses; [ lgpl21 gpl2 mit ];
     platforms = platforms.linux;
     maintainers = [ maintainers.bjornfor ];
+    broken = (kernel.features.grsecurity or false);
   };
 
 }