Build druntime with -edition=2024 compiler switch

[ntrel]

Note: switch added in #22248.

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Testing this PR locally

If you don't have a local development environment setup, you can use Digger to test this PR:

dub run digger -- build "master + dmd#22275"

[ntrel]

Build failing because #22244 was merged.

Also probably only some of the CI jobs should use the edition switch. Perhaps only the ones that run the style check.

[ntrel]

Build failing because #22244 was merged.

I'm trying dfix with libdparse updated on druntime as it has support for fixing old alias declarations, but I found 2 bugs so far: dlang-community/dfix#62

[Herringway]

Isn't it possible that compiling with a different edition may result in different symbols?

[ntrel]

I'm trying dfix with dlang-community/dfix#61 on druntime

This is going quite well, I fixed the dfix bugs. I have to keep taking breaks reviewing the massive druntime/src/core/sys/windows/ diff though. There are a lot of aliases there 😱

[thewilsonator]

Thank you so much for doing this!