mlx42: fix build with clang

[TomaSajt]

Hydra failure:
https://hydra.nixos.org/build/281928086/nixlog/3

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 25.05 Release Notes (or backporting 24.11 and 25.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

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[paparodeo]

clang error: argument '-Ofast' is deprecated; use '-O3 -ffast-math' for the same behavior, or '-O3' to enable only conforming optimizations [-Werror,-Wdeprecated-ofast]
make[2]: *** [CMakeFiles/mlx42.dir/build.make:98: CMakeFiles/mlx42.dir/src/mlx_exit.c.o] Error 1

given that they are compiling with -Werror this should be reported upstream so they can fix the problem -- they may not be aware that -Ofast implies -ffast-math which is one of the reasons this is depreciated.

[TomaSajt]

I'll report it upstream
Edit: opened: codam-coding-college/MLX42#147

[paparodeo]

reference the issue in the patch and then LGTM