riotbuild: add libsdl2-dev:amd64

[fzi-haxel]

Adds the 64-bit version of libsdl2-dev required for the 64-bit version of native.
Needed in RIOT-OS/RIOT#20335

libsdl2-dev has quite a few dependencies and adds about 190MB to the image.
If this is too much, I could also blacklist tests_lvgl and tests_lvgl_touch for the CI.

[benpicco]

Arg, I think the problem is that the libsdl2-dev:i386 package conflicts with libsdl2-dev 😕

[fzi-haxel]

Arg, I think the problem is that the libsdl2-dev:i386 package conflicts with libsdl2-dev 😕

Mh, apt does not complain about installing libsdl2-dev, but the rust build test fails. I'm not sure if they are related.
I tried building the image locally and for me the rust test and the native64 lvgl test worked.

[fzi-haxel]

Re-running the build doesn't seem to fix it. I will try to reproduce the problem on Monday. Maybe it's because I didn't build the base images.

[chrysn]

I'm adding another re-run here. This kind of error (fatal error: 'preprocessor_successor.h' file not found) has been seen occasionally, but never was stable enough to be really reproduced; chances are it's going away now that I'm looking at it with 2 days time passed :-/

[chrysn]

Failed again. Retrying master to verify my assumption that this is a failure unrelated to the content of this PR.

[kaspar030]

Failed again. Retrying master to verify my assumption that this is a failure unrelated to the content of this PR.

I've seen this a couple of times in this repo, usually some retries make CI pass.

[kaspar030]

I've opened an issue. It's probably a race in the riot repo that somehow shows here more often.

[chrysn]

Please rebase onto #246 (or master once that is in), that should make the problem go away.

[fzi-haxel]

Please rebase onto #246 (or master once that is in), that should make the problem go away.

Rebased on master