linux-libre: unbreak

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

@@ -16,7 +16,7 @@ let
 
 in linux.override {
   argsOverride = {
-    modDirVersion = "${linux.modDirVersion}-gnu";
+    modDirVersion = "${linux.modDirVersion}-gnu1";
     isLibre = true;
 
     src = stdenv.mkDerivation {
@@ -35,8 +35,6 @@ in linux.override {
       '';
     };
 
-    extraMeta.broken = true;
-
     passthru.updateScript = ./update-libre.sh;
 
     maintainers = [ lib.maintainers.qyliss ];