ceph: fix cmake 4 failure on arrow-cpp

[limwa]

In staging-next, ceph does not build because its vendored arrow-cpp does not support CMake 4.

Upstream has merged a patch (apache/arrow#45997) that sets the minimum policy version for its third-party dependencies.

This pull request adds that patch to ceph's arrow-cpp build.

Things done

• Built on platform:
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• Tested, as applicable:
  • NixOS tests in nixos/tests.
  • Package tests at passthru.tests.
  • Tests in lib/tests or pkgs/test for functions and "core" functionality.
• Ran nixpkgs-review on this PR. See nixpkgs-review usage.
• Tested basic functionality of all binary files, usually in ./result/bin/.
• Nixpkgs Release Notes
  • Package update: when the change is major or breaking.
• NixOS Release Notes
  • Module addition: when adding a new NixOS module.
  • Module update: when the change is significant.
• Fits CONTRIBUTING.md, pkgs/README.md, maintainers/README.md and other READMEs.

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[emilazy]

See also #451118 from a few minutes ago :)

CMake 4 is in master now, so staging is probably the wrong target branch here?

[limwa]

I targeted staging because ceph already does not build on master because of python-tkinter and the fix for that is in staging.

See also #451118 from a few minutes ago :)

That's unlucky hahaha, I was just waiting for the package to finish building :')

[limwa]

I'll close this PR, thank you!

[emilazy]

I targeted staging because ceph already does not build on master because of python-tkinter and the fix for that is in staging.

Ah, forgot about that :)