[emscripten] Fixes for data addresses above 2gb

[sbc100]

This includes both wasm64 and wasm32 when addressing more than 2gb of memory.

Fixes: #9052

[sbc100]

I did this work against the SDL2 branch so that I could test it in the emscripten repo. Would it be reasonable to land this here first and the forward-port the patch to SDL3(main)?

[slouken]

Yep, that's fine. These changes look good to me, @icculus?

[icculus]

I'll merge this into SDL3 after dinner, if no one else beats me to it.

[icculus]

Okay, merged to SDL3 in 02434cd, thanks!

[sbc100]

Is there any chance that an SDL2 release or tag is coming any time soon? Emscripten is currently setup to pull from a tag in this repo and I'd love to pull in these changes. Perhaps you could do a "prerelease" tag?

[slouken]

Is there any chance that an SDL2 release or tag is coming any time soon? Emscripten is currently setup to pull from a tag in this repo and I'd love to pull in these changes. Perhaps you could do a "prerelease" tag?

I just pulled these changes into the release-2.30.x branch, which will be released on 11/1. You're welcome to use that as a prerelease tag if you want. It's getting minimal safe changes, so it should be fine to use until the 2.32 release.

[sbc100]

Any chance you could tag release-2.30.x as prerelease-2.30.9 now or is that not how it works?

[slouken]

No, that's not how that works.