sdl3: 3.2.18 -> 3.2.20

[LordGrimmauld]

Changelog: https://github.com/libsdl-org/SDL/releases/tag/release-3.2.20

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.

---

Add a 👍 reaction to pull requests you find important.

[pbsds]

ofborg is having a moment, but i built sdl3 and sdl3.passthru.tests locally after cherry-picking on master

[nixpkgs-ci]

Backport failed for staging-25.05, because it was unable to cherry-pick the commit(s).

Please cherry-pick the changes locally and resolve any conflicts.

git fetch origin staging-25.05
git worktree add -d .worktree/backport-431182-to-staging-25.05 origin/staging-25.05
cd .worktree/backport-431182-to-staging-25.05
git switch --create backport-431182-to-staging-25.05
git cherry-pick -x d9e041f0e9b794413d392c8d4c704a0fae49b344

[LordGrimmauld]

i'll do the manual backport in a bit

[LordGrimmauld]

backport in #431812