fixup

Signed-off-by: Douglas Reis <doreis@lowrisc.org>

Author: engdoreis

flake.nix

@@ -73,6 +73,7 @@
       ftditool-cli = inputs.ftditool.packages.${system}.default;
       cheri-toolchain = pkgs.callPackage ./nix/cheri_toolchain.nix {inherit (lrPkgs) llvm_cheri;};
       commonPackages = with pkgs; [
+        gcc15
         bison
         cmake
         flex