Archive sdl2-feedstock

[ymontmarin]

Following the discussion here: conda-forge/staged-recipes#29061, the recipes for packages sdl, sdl2, sdl3 are now all released through the feedstock: https://github.com/conda-forge/sdl-feedstock.

Thus, the feedstock: https://github.com/conda-forge/sdl2-feedstock can be archived as mentioned in the issue: conda-forge/sdl2-feedstock#61.

@dschreij, @matham, @traversaro do you validate the approach ?

Checklist:

• I want to archive a feedstock:
  • Pinged the team for that feedstock for their input.
  • Make sure you have opened an issue on the feedstock explaining why it was archived.
  • Linked that issue in this PR description.
  • Added links to any other relevant issues/PRs in the PR description.

[traversaro]

@dschreij, @matham, @traversaro do you validate the approach ?

I agree!