Nix: disable fortify for devshell (#4463)

This disables '_FORTIFY_SOURCE' Werrors trying to compile wlroots.
Long standing issue in https://github.com/NixOS/nixpkgs/issues/60919
afaik.

After this change you should be able to:
```
nix develop
mmeson setup build -Dbuildtype=debug
ninja -C build
```

1 files changed, 1 insertions, 0 deletions

diff --git a/flake.nix b/flake.nix
index 7f9a958b..40d04489 100644
--- a/flake.nix
+++ b/flake.nix
@@ -86,6 +86,7 @@
           name = "hyprland-shell";
           nativeBuildInputs = with pkgsFor.${system}; [cmake python3];
           buildInputs = [self.packages.${system}.wlroots-hyprland];
+          hardeningDisable = [ "fortify" ];
           inputsFrom = [
             self.packages.${system}.wlroots-hyprland
             self.packages.${system}.hyprland