gnome2.gtksourceview: fix Darwin build

[samestep]

ZHF: #516381

This PR fixes the gnome2.gtksourceview package build on aarch64-darwin (broken since #507470 updated autoconf) via the same pattern used by #425784, #426625, and #475284. See this for more context on those historical failures, and see the autoconf 2.73 release notes which mention the autopoint heuristic change that broke this particular package.

This build failure is Darwin-specific because autoreconf only runs on Darwin for this package.

Closes: #522127

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.
• Follows the automation/AI policy.

[samestep]

nixpkgs-review result

Generated using nixpkgs-review.

Command: nixpkgs-review
Commit: d8e818e9f5fb4b614db8b7cef69dc4865843f278

---

aarch64-darwin

⏩ 5 packages marked as broken and skipped:

• coq_8_7
• coq_8_8
• coq_8_9
• ocamlPackages.lablgtk-extras
• ocamlPackages.ocaml_cairo

❌ 3 packages failed to build:

• heptagon
• ocamlPackages.zelus-gtk
• prooftree

✅ 8 packages built:

• advi
• glsurf
• gnome2.gtksourceview
• ocamlPackages.camlimages
• ocamlPackages.lablgtk
• ocamlPackages.ocamlgraph_gtk
• proverifWithGui
• satysfi

[SuperSandro2000]

I would rather vouche to remove this gnome 2 package entirely.

[samestep]

@SuperSandro2000 sounds good: #522127

[phibkro]

Built successfully on x86_64-darwin (nix-build -A gnome2.gtksourceview), producing gtksourceview-2.10.5.

For cross-reference, the alternative fix in #523652 (the ACLOCAL_PATH approach) also builds cleanly on x86_64-darwin. So both proposed fixes resolve the failure — which suggests dropping the package (#522127) isn't necessary on build grounds; it's down to which fix is preferred.

_{Disclosure: build verification performed with an AI agent (Claude Code, claude-opus-4-8) on x86_64-darwin; results reviewed by me.}