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sdl2-compat: Add more relevant passthru tests
`monado` was added in #380523 to show `sdl2-compat` could be used to build SDL2 programs when `sdl2-compat` was first added. It is not particularly load-bearing, and because it depends on OpenCV it is quite expensive to build from source in a world-rebuild. I propose instead testing `SDL_compat`, `ffmpeg` and `qemu`. These packages are much more important for nixpkgs as a whole, either testing SDL, being required for most gui apps, or building VM tests. `qemu` on darwin does not enable sdl support, so that check is linux-only.