nix: native: Disable format-security hardening

Fixes the error:

error: format not a string literal and no format arguments [-Werror=format-security]
318 |           fprintf (f, prefix);

flake.nix

@@ -162,6 +162,8 @@
             xtrans # libX11
           ];
 
+          hardeningDisable = [ "format" ];
+
           LD_LIBRARY_PATH = pkgs.lib.makeLibraryPath buildInputs;
           PERL_PATH = "${pkgs.perl}/bin/perl";
           SKIP_CHECK_TOOLS = "1";