sonic-server: fix build with GCC 15

[anthonyroussel]

See #475479, valeriansaliou/sonic#337

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.

[anthonyroussel]

nixpkgs-review result

Generated using nixpkgs-review-gha

Command: nixpkgs-review pr 490266
Commit: 333b1fb6302894e4ad59be4961f3e9467562072b (subsequent changes)
Merge: 8910561dee730bfc83297e1dade83988fb17996d

Logs: https://github.com/anthonyroussel/nixpkgs-review-gha/actions/runs/22007455676

---

x86_64-linux

✅ 1 package built:

• sonic-server

---

aarch64-linux

✅ 1 package built:

• sonic-server

---

x86_64-darwin (sandbox = relaxed)

✅ 1 package built:

• sonic-server

---

aarch64-darwin (sandbox = relaxed)

✅ 1 package built:

• sonic-server

[anthonyroussel]

Bot check is failing:

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@pleshevskiy cannot be added as reviewer of this PR.

Looks like this issue already happened here: #370456 (comment)

Maybe this user enabled Code review limits for NixOS or enabled temporary interaction limits.

[mdaniels5757]

I split your second commit into #490497: we'll have to wait a week for that, but don't need to wait for this one.